JUSTIN F GAINOR MD
NPI 1487813010
Internal Medicine - Medical Oncology in Boston, MA

NPI Status: Active since June 09, 2008

Contact Information

MASSACHUSETTS GENERAL HOSPITAL
55 FRUIT STREET
BOSTON, MA
ZIP 02114
Phone: (617) 726-2862

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  • Individual
  • Male
  • Years of Experience 18
  • Internal Medicine
  • Medical Oncology
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About JUSTIN GAINOR

This page provides the complete NPI Profile along with additional information for Justin Gainor, an internist established in Boston, Massachusetts with a medical specialization in Internal Medicine, focusing in medical oncology and more than 18 years of experience. He graduated from Harvard Medical School in 2008. The healthcare provider is registered in the NPI registry with number 1487813010 assigned on June 2008. The practitioner's primary taxonomy code is 207RX0202X with license number 245561 (MA). The provider is registered as an individual and his NPI record was last updated 12 years ago.

NPI
1487813010
Provider Name
JUSTIN F GAINOR MD
Gender
Male
Entity Type
Individual
Location Address
MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
Location Phone
(617) 726-2862
Mailing Address
MASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET BOSTON, MA 02114
Mailing Phone
(617) 724-4000
Medical School Name
HARVARD MEDICAL SCHOOL
Graduation Year
2008
Is Sole Proprietor?
No
Enumeration Date
06-09-2008
Last Update Date
07-29-2013
Code Navigator

An internist like Justin Gainor 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 Medical Oncology

Taxonomy Code
207RX0202X
Type
Allopathic & Osteopathic Physicians
License No.
245561
License State
MA
Taxonomy Description
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

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

L-236372 (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

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

Medicare Participation & PECOS Enrollment Status

Justin Gainor 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.

Justin Gainor 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: 547437600

    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: I20130925000694

    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.

Established patient office or other outpatient visit, 20-29 minutes

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

This service was performed 50 times for 34 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 102 times for 54 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 235 times for 81 patients

Follow-up hospital inpatient care per day, typically 25 minutes

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

This service was performed 46 times for 22 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 56 times for 31 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 18 times for 17 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 22 times for 20 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $47.46 for a new patient copayment and $27.79 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 99205

  • Average New Patient Price $189.86
  • Minimum New Patient Price $63.72
  • Maximum New Patient Price $189.86
  • Average New Patient Copayment $47.46
  • 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 99214

  • Average Established Patient Price $111.18
  • Minimum Established Patient Price $21.07
  • Maximum Established Patient Price $155.29
  • Average Established Patient Copayment $27.79
  • 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. Justin Gainor 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
MARTHA'S VINEYARD HOSPITAL INCONE HOSPITAL ROAD, FIRST FL, WING 5, PO BOX 1477
OAK BLUFFS, MA 02557
(508) 693-0410Critical Access 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.
1487813010
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
24167161602
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 4 + 1 + 6 + 7 + 1 + 6 + 1 + 6 + 0 + 2 + 24 = 60
Step 3: because the number obtained in step 2 ends in zero, the check digit is zero.
0

The NPI number 1487813010 is valid because the calculated check digit 0 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
1013941772 ILONA T GOLDFARB M.D.
Individual
Obstetrics & GynecologyMASSACHUSETTS GENERAL HOSPITAL 55 FRUIT STREET
BOSTON, MA 02114
(617) 726-2000
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

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1487813010, enumerated in the NPI registry as an "individual" on June 09, 2008

The provider is located at Massachusetts General Hospital 55 Fruit Street Boston, Ma 02114 and the phone number is (617) 726-2862

The provider's speciality is Internal Medicine with taxonomy code 207RX0202X with a focus in Medical Oncology

The provider has more than 18 years of experience. He graduated from Harvard Medical School in 2008.

The provider might be accepting Accepts: Anthem Blue Cross and Blue Shield. 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 $189.86 with an average copayment of $47.46 for new patient appointments. Established patients should expect a typical charge of $111.18 and an average copayment of 27.79. 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: Established patient office or other outpatient visit, 20-29 minutes, 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 25 minutes, Follow-up hospital inpatient care per day, typically 35 minutes, Initial hospital inpatient care per day, typically 70 minutes and Telephone medical discussion with physician, 21-30 minutes.

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

This NPI record was last updated on June 09, 2008. 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.