DR. TOMAS GERALD NEILAN MD
NPI 1437285145
Internal Medicine - Cardiovascular Disease in Boston, MA

NPI Status: Active since February 26, 2007

Contact Information

MASSACHUSETTS GENERAL HOSPITAL
55 FRUIT STREET
BOSTON, MA
ZIP 02114
Phone: (617) 724-2700

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  • Individual
  • Male
  • Years of Experience 30
  • Internal Medicine
  • Cardiovascular Disease
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About TOMAS NEILAN

This page provides the complete NPI Profile along with additional information for Tomas Neilan, an internist established in Boston, Massachusetts with a medical specialization in Internal Medicine, focusing in cardiovascular disease and more than 30 years of experience. The healthcare provider is registered in the NPI registry with number 1437285145 assigned on February 2007. The practitioner's primary taxonomy code is 207RC0000X with license number 234637 (MA). The provider is registered as an individual and his NPI record was last updated 13 years ago.

NPI
1437285145
Provider Name
DR. TOMAS GERALD NEILAN MD
Other Name Type
Professional Name (2)
Gender
Male
Entity Type
Individual
Location Address
MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
Location Phone
(617) 724-2700
Mailing Address
MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
Mailing Phone
(617) 724-2700
Medical School Name
OTHER
Graduation Year
1996
Is Sole Proprietor?
No
Enumeration Date
02-26-2007
Last Update Date
06-30-2012
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An internist like Tomas Neilan is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Cardiovascular Disease

Taxonomy Code
207RC0000X
Type
Allopathic & Osteopathic Physicians
License No.
234637
License State
MA
Taxonomy Description
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207R00000XAllopathic & Osteopathic Physicians

Internal Medicine

234637 (MA)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Anthem Bronze Access Blue New England HMO 5000/10%/8000 w/HSA - HMO
  • Anthem Bronze Access Blue New England HMO 5000/20%/8000 w/HSA - HMO
  • Anthem Bronze Access Blue New England HMO 6500/30%/9200 Value - HMO
  • Anthem Bronze Access Blue New England HMO 7000/50%/8000 w/HSA - HMO
  • Anthem Bronze Access Blue New England HMO 8500/50%/9200 - HMO
  • Anthem Gold Access Blue New England HMO 1000/20%/7500 - HMO
  • Anthem Gold Access Blue New England HMO 2000/0%/6500 RxD - HMO
  • Anthem Gold Access Blue New England HMO 2000/10%/4600 w/HSA - HMO
  • Anthem Gold Access Blue New England HMO 2000/10%/7500 - HMO
  • Anthem Gold Access Blue New England HMO 2000/20%/4600 w/HSA - HMO
  • Anthem Gold Access Blue New England HMO 3000/0%/5500 RxD - HMO
  • Anthem Gold Access Blue New England HMO 500/25%/7000 - HMO
  • Anthem Platinum Access Blue New England HMO 250/10%/3500 - HMO
  • Anthem Silver Access Blue New England HMO 2000/30%/9000 Value - HMO
  • Anthem Silver Access Blue New England HMO 3000/20%/8500 - HMO
  • Anthem Silver Access Blue New England HMO 3000/30%/9000 Value - HMO
  • Anthem Silver Access Blue New England HMO 3500/20%/7250 w/HSA - HMO
  • Anthem Silver Access Blue New England HMO 4000/0%/8500 - HMO
  • Anthem Silver Access Blue New England HMO 4000/0%/8500 RxD - HMO
  • Anthem Silver Access Blue New England HMO 4000/10%/7250 w/HSA - HMO

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
110088962AMEDICAID (05)MA 
000772802MEDICARE PIN (08)MA 

Medicare Participation & PECOS Enrollment Status

Tomas Neilan is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Tomas Neilan is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 7416016738

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20081031000323

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Electrocardiogram (ecg) 1 to 3 leads with review by physician only

An Electrocardiogram (ECG) is a non-invasive test that records the electrical activity of your heart. 1 to 3 leads or sensors are placed on your body to capture this data. A physician then reviews the results to evaluate your heart's health.

This service was performed 112 times for 50 patients

Established patient office or other outpatient visit, 30-39 minutes

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

This service was performed 103 times for 93 patients

Established patient office or other outpatient visit, 40-54 minutes

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

This service was performed 214 times for 192 patients

Follow-up hospital inpatient care per day, typically 35 minutes

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

This service was performed 136 times for 51 patients

Initial hospital inpatient care per day, typically 70 minutes

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

This service was performed 33 times for 33 patients

New patient office or other outpatient visit, 60-74 minutes

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

This service was performed 37 times for 37 patients

Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or

This service refers to extended doctor visits where your healthcare provider spends additional time evaluating and managing your health beyond the primary procedure's required time. This includes each extra 15 minutes spent by the physician on the same day as the primary service.

This service was performed 134 times for 83 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

This service was performed 343 times for 250 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

This service was performed 727 times for 597 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

This service was performed 23 times for 23 patients

Telephone medical discussion with physician, 21-30 minutes

This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.

This service was performed 12 times for 12 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $36.02 for a new patient copayment and $19.71 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 02114 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $144.11
  • Minimum New Patient Price $63.72
  • Maximum New Patient Price $189.86
  • Average New Patient Copayment $36.02
  • Minimum New Patient Copayment $15.93
  • Maximum New Patient Copayment $47.46

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99213

  • Average Established Patient Price $78.84
  • Minimum Established Patient Price $21.07
  • Maximum Established Patient Price $155.29
  • Average Established Patient Copayment $19.71
  • Minimum Established Patient Copayment $5.26
  • Maximum Established Patient Copayment $38.82

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Tomas Neilan is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
MASSACHUSETTS GENERAL HOSPITAL55 FRUIT STREET
BOSTON, MA 02114
(617) 724-9725Acute Care Hospitals
BRIGHAM AND WOMEN'S HOSPITAL75 FRANCIS STREET
BOSTON, MA 02115
(617) 732-5500Acute Care Hospitals

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NPI Validation Check Digit Calculation


The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.

Start with the original NPI number, the last digit is the check digit and is not used in the calculation.
1437285145
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
2467481018
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 4 + 6 + 7 + 4 + 8 + 1 + 0 + 1 + 8 + 24 = 65
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
70 - 65 = 55

The NPI number 1437285145 is valid because the calculated check digit 5 using the Luhn validation algorithm matches the last digit of the original NPI number.

Other Providers at the Same Location


The following 20 providers are registered at the same or nearby location.

NPI Name / Type Taxonomy Address
1033197116 DANIEL J COSTELLO M.D.
Individual
Psychiatry & Neurology (Neurology)MASSACHUSETTS GENERAL HOSPITAL WACC 835, 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2000
1063470458 HOLLY R KHACHADOORIAN-ELIA M.D.
Individual
Obstetrics & GynecologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET - FOUNDERS 4
BOSTON, MA 02114
(617) 724-2640
1447280367DR. SONITA MARIE SADIO MD
Individual
UrologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET GRB 1102
BOSTON, MA 02114
(617) 726-2066
1043244700 CESAR F GONZALEZ SALADIN M.D.
Individual
Radiology (Diagnostic Radiology)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-8396
1336173087DR. CHARLES C HARDIN M.D.,PH.D
Individual
Internal MedicineMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2000
1912932971 EMILY M HAYDEN M.D.
Individual
Emergency MedicineMASSACHUSETTS GENERAL HOSPITAL FIVE EMERSON PLACE, SUITE 170
BOSTON, MA 02114
(617) 726-2000
1861417560 ANDREW S LITEPLO M.D.
Individual
Emergency MedicineMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2000
1619084209 JAMES L LADNER M.D.
Individual
AnesthesiologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-8392
1558479873 NASSER I KHAN M.D.
Individual
Internal MedicineMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2375
1245335637 NELLY PITTELOUD M.D.
Individual
Internal Medicine (Endocrinology, Diabetes & Metabolism)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT ST. REV.BHE 5
BOSTON, MA 02114
(617) 724-1830
1881793172 ABRAHAM M LIBERMAN M.D.
Individual
Thoracic Surgery (Cardiothoracic Vascular Surgery)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2806
1093890196 ROBERT N PECK M.D.
Individual
Internal MedicineMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET/PEDIATRICS
BOSTON, MA 02114
(617) 304-6375
1982777132 DAVID R KAUFMAN M.D.
Individual
Internal Medicine (Infectious Disease)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT ST., COX-5
BOSTON, MA 02114
(617) 726-3906
1427121672 MARWAN M REFAAT M.D.
Individual
Internal MedicineMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2000
1639242860 ERIC C MATTEN M.D.
Individual
AnesthesiologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-3030
1922155381 DIETER MANSTEIN MD
Individual
DermatologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-4893
1235287905MR. STANLEY WASSERMAN PHYSICIAN ASSISTANT
Individual
Physician Assistant (Surgical)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET, BULFINCH 119
BOSTON, MA 02114
(617) 726-1861
1285784488 ARULNMOZHY THANGAROOPAN M.D.
Individual
Radiology (Diagnostic Radiology)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-5954
1932234101 NANCY GOODE PT, DPT, MS
Individual
Physical TherapistMASSACHUSETTS GENERAL HOSPITAL 15 PARKMAN ST WACC 134
BOSTON, MA 02114
(617) 724-8579
1750417515 OLGA KULINETS KOLMAN MD
Individual
Pathology (Anatomic Pathology & Clinical Pathology)MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2967

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1437285145, enumerated in the NPI registry as an "individual" on February 26, 2007

The provider is located at Massachusetts General Hospital 55 Fruit Street Boston, Ma 02114 and the phone number is (617) 724-2700

The provider's speciality is Internal Medicine with taxonomy code 207RC0000X with a focus in Cardiovascular Disease

The provider has more than 30 years of experience.

The provider might be accepting Accepts: Anthem Blue Cross and Blue Shield, Medicare and. Please consult your insurance carrier or call the provider to make sure your health plan is currently accepted.

Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

Medicare beneficiaries should expect a typical cost of $144.11 with an average copayment of $36.02 for new patient appointments. Established patients should expect a typical charge of $78.84 and an average copayment of 19.71. Please review your insurance plan or contact the provider directly to determine your specific costs.

The most common procedures or services performed by this practitioner are: Electrocardiogram (ecg) 1 to 3 leads with review by physician only, Established patient office or other outpatient visit, 30-39 minutes, Established patient office or other outpatient visit, 40-54 minutes, Follow-up hospital inpatient care per day, typically 35 minutes, Initial hospital inpatient care per day, typically 70 minutes, New patient office or other outpatient visit, 60-74 minutes, Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or, Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report, Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only, Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only and Telephone medical discussion with physician, 21-30 minutes.

The practitioner is affiliated to the following hospital(s): MASSACHUSETTS GENERAL HOSPITAL and BRIGHAM AND WOMEN'S HOSPITAL. Hospital affiliations are identified through self-reporting data and service claims based on the place of service.

This NPI record was last updated on February 26, 2007. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.