DR. REX NEAL SMITH MD PHD
NPI 1801870910
Pathology - Immunopathology in Boston, MA

NPI Status: Active since December 01, 2005

Contact Information

55 FRUIT STREET
WRN 2 PATHOLOGY ASSOCIATES
BOSTON, MA
ZIP 02114
Phone: (617) 726-1835
Fax: (617) 726-2365

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  • Individual
  • Male
  • Years of Experience 34
  • Pathology
  • Immunopathology
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About REX SMITH

This page provides the complete NPI Profile along with additional information for Rex Smith, a provider established in Boston, Massachusetts with a medical specialization in Pathology, focusing in immunopathology and more than 34 years of experience. He graduated from Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University in 1992. The healthcare provider is registered in the NPI registry with number 1801870910 assigned on December 2005. The practitioner's primary taxonomy code is 207ZI0100X with license number 150072 (MA). The provider is registered as an individual and his NPI record was last updated September 2025.

NPI
1801870910
Provider Name
DR. REX NEAL SMITH MD PHD
Gender
Male
Entity Type
Individual
Location Address
55 FRUIT STREET WRN 2 PATHOLOGY ASSOCIATES BOSTON, MA 02114
Location Phone
(617) 726-1835
Location Fax
(617) 726-2365
Mailing Address
PO BOX 9142 MASS GENERAL PHYSICIAN ORGANIZATION CHARLESTOWN, MA 02129
Mailing Phone
(617) 724-0287
Mailing Fax
(617) 726-2365
Medical School Name
CLVLND CLINIC LERNER COLLEGE OF MED OF CASE WSTN RSV UNIVERSITY
Graduation Year
1992
Is Sole Proprietor?
Yes
Enumeration Date
12-01-2005
Last Update Date
09-11-2025
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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

Pathology Immunopathology

Taxonomy Code
207ZI0100X
Type
Allopathic & Osteopathic Physicians
License No.
150072
License State
MA
Taxonomy Description
A pathologist who specializes in the diagnosis of immunologic diseases.

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)
1207ZP0102XAllopathic & Osteopathic Physicians

Pathology
Anatomic Pathology & Clinical Pathology

150072 (MA)

Insurance Plans Accepted

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

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.

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
3156630MEDICAID (05)MA 
J16831OTHER (01)MABCBS MA
150072OTHER (01)MATUFTS HEALTH PLAN

Medicare Participation & PECOS Enrollment Status

Rex Smith 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.

Rex Smith 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: 7810180056

    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: I20101020001445

    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.

Antibody evaluation, each additional single antibody stain procedure

An antibody evaluation involves testing a sample of your body fluid (like blood) to identify specific antibodies. Each additional single antibody stain procedure is a separate test for another specific antibody. This helps in diagnosing various health conditions by understanding your body's immune response.

This service was performed 227 times for 26 patients

Antibody evaluation, initial single antibody stain procedure

An antibody evaluation, initial single antibody stain procedure is a laboratory test. It's designed to identify specific proteins, or antibodies, in your body. This can help diagnose certain conditions or monitor your immune system's response to treatments. The procedure involves staining a single type of antibody for detection.

This service was performed 73 times for 68 patients

Electron microscopy for diagnosis

Electron microscopy is a diagnostic tool providing detailed images of tiny structures within the body, much smaller than those visible with regular microscopes. It aids in identifying diseases at a cellular level, enhancing accuracy of diagnosis.

This service was performed 25 times for 25 patients

Pathology examination of tissue using a microscope, intermediate complexity

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

This service was performed 134 times for 101 patients

Pathology examination of tissue using a microscope, moderately high complexity

A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.

This service was performed 67 times for 48 patients

Pathology examination of tissue using a microscope, moderately low complexity

A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.

This service was performed 16 times for 14 patients

Preparation of tissue for examination by removing any calcium present

This procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.

This service was performed 29 times for 26 patients

Protein measurement

A protein measurement is a blood test that measures the total amount of protein in your body. This includes albumin and globulins, vital for maintaining health. It helps identify nutritional problems, kidney disease, liver disease, and other medical conditions.

This service was performed 40 times for 39 patients

Special stained specimen slides to examine tissue including interpretation and report

Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.

This service was performed 135 times for 54 patients

Special stained specimen slides to examine tissue, each additional procedure

Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.

This service was performed 54 times for 18 patients

Special stained specimen slides to examine tissue, initial procedure

This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.

This service was performed 20 times for 20 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 $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 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 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. Rex Smith is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
NORTH SHORE MEDICAL CENTER -81 HIGHLAND AVENUE
SALEM, MA 01970
(978) 741-1215Acute Care Hospitals
MASSACHUSETTS GENERAL HOSPITAL55 FRUIT STREET
BOSTON, MA 02114
(617) 724-9725Acute Care Hospitals
MASSACHUSETTS EYE AND EAR INFIRMARY -243 CHARLES STREET
BOSTON, MA 02114
(617) 523-7900Acute Care Hospitals
NEWTON-WELLESLEY HOSPITAL2014 WASHINGTON STREET
NEWTON, MA 02462
(617) 243-6000Acute 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.
1801870910
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
2801167092
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 8 + 0 + 1 + 1 + 6 + 7 + 0 + 9 + 2 + 24 = 60
Step 3: because the number obtained in step 2 ends in zero, the check digit is zero.
0

The NPI number 1801870910 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
1962492603DR. MARYETTA E. KING M.D.
Individual
Pediatrics55 FRUIT STREET YAWKEY 5-062 MASSACHUSETTS GENERAL HOSPITAL
BOSTON, MA 02114
(617) 726-3826
1457341646DR. XIANGWEI ZHANG MD MS
Individual
Anesthesiology55 FRUIT STREET CLN 309
BOSTON, MA 02114
(617) 726-3030
1134119449DR. VILMA ENID ORTIZ MD
Individual
Anesthesiology55 FRUIT STREET CLN 3
BOSTON, MA 02114
(617) 726-3452
1780674812DR. FUMITO ICHINOSE MD
Individual
Anesthesiology55 FRUIT STREET CLN 3
BOSTON, MA 02114
(617) 726-8980
1265414551DR. RAFAEL VICENTE PIERETTI MD
Individual
Urology (Pediatric Urology)55 FRUIT STREET WRN 11
BOSTON, MA 02114
(617) 724-0518
1689656738DR. J KENNETH DAVISON MD DDS
Individual
Anesthesiology55 FRUIT STREET GRB 406E
BOSTON, MA 02114
(617) 724-7181
1710969233DR. SUSAN ROVAINE BROWN MD
Individual
Psychiatry & Neurology (Psychiatry)55 FRUIT STREET WHT 130
BOSTON, MA 02114
(617) 726-2994
1912980806DR. AHMED BASSEM ELAINI MD
Individual
Radiology (Diagnostic Radiology)55 FRUIT STREET FND 216 RADIOLOGICAL ASSOCIATES
BOSTON, MA 02114
(617) 724-4255
1649253386DR. CHRISTIANA A IYASERE MD
Individual
Internal Medicine55 FRUIT STREET BAR 917 MEDICAL ACCESS UNIT
BOSTON, MA 02114
(617) 724-7491
1225012560 FRANK E HOKEMA MD
Individual
Anesthesiology55 FRUIT STREET CLN 309
BOSTON, MA 02114
(617) 726-3030
1063496479DR. JENNIFER S TEMEL MD
Individual
Internal Medicine (Medical Oncology)55 FRUIT STREET YAW 7B HEMATOLOGY/ONCOLOGY
BOSTON, MA 02114
(617) 724-1136
1609851658DR. ROBERT L DOYLE MD
Individual
Psychiatry & Neurology (Psychiatry)55 FRUIT STREET YAW 6900 CHILD & ADOLESCENT PSYCHIATRY
BOSTON, MA 02114
(617) 726-6300
1457336125DR. PETER FRANCIS DUNN MD
Individual
Anesthesiology (Critical Care Medicine)55 FRUIT STREET CLN 2 ANESTHESIA ASSOCIATES
BOSTON, MA 02114
(617) 726-7542
1518946441DR. MARIA TERESA VIVALDI MD
Individual
Internal Medicine (Cardiovascular Disease)55 FRUIT STREET VBK 508
BOSTON, MA 02114
(617) 726-8871
1144209461DR. SHABIN NANJI MBBC
Individual
Pathology (Anatomic Pathology & Clinical Pathology)55 FRUIT STREET MASSACHUSETTS GENERAL HOSPITAL WRN 219
BOSTON, MA 02114
(617) 724-1422
1003889445DR. NANCY LEE HARRIS MD
Individual
Pathology (Anatomic Pathology & Clinical Pathology)55 FRUIT STREET WRN 2 PATHOLOGY ASSOCIATES
BOSTON, MA 02114
(617) 726-5155
1306810015DR. JEREMY SCHMAHMANN MD
Individual
Psychiatry & Neurology (Neurology)55 FRUIT STREET VBK 915
BOSTON, MA 02114
(617) 726-3216
1932176518 DANA CVRK CNM
Individual
Advanced Practice Midwife55 FRUIT STREET YAW 4
BOSTON, MA 02114
(617) 724-2229
1922075514 SUSAN HERNANDEZ CNM
Individual
Advanced Practice Midwife55 FRUIT STREET YAW 4
BOSTON, MA 02114
(617) 724-2229
1891762480 PAULINE RATTA CNM
Individual
Advanced Practice Midwife55 FRUIT STREET YAW 4
BOSTON, MA 02114
(617) 724-2229

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1801870910, enumerated in the NPI registry as an "individual" on December 01, 2005

The provider is located at 55 Fruit Street Wrn 2 Pathology Associates Boston, Ma 02114 and the phone number is (617) 726-1835

The provider's speciality is Pathology with taxonomy code 207ZI0100X with a focus in Immunopathology

The provider has more than 34 years of experience. He graduated from Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University in 1992.

The provider might be accepting Accepts: Medicare, Medicaid, Blue Cross Blue Shield 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 $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: Antibody evaluation, each additional single antibody stain procedure, Antibody evaluation, initial single antibody stain procedure, Electron microscopy for diagnosis, Pathology examination of tissue using a microscope, intermediate complexity, Pathology examination of tissue using a microscope, moderately high complexity, Pathology examination of tissue using a microscope, moderately low complexity, Preparation of tissue for examination by removing any calcium present, Protein measurement, Special stained specimen slides to examine tissue including interpretation and report, Special stained specimen slides to examine tissue, each additional procedure and Special stained specimen slides to examine tissue, initial procedure.

The practitioner is affiliated to the following hospital(s): NORTH SHORE MEDICAL CENTER -, MASSACHUSETTS GENERAL HOSPITAL, MASSACHUSETTS EYE AND EAR INFIRMARY - and NEWTON-WELLESLEY 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 December 01, 2005. 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.