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 one year ago.

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
MASSACHUSETTS GENERAL HOSPITAL55 FRUIT STREET
BOSTON, MA 02114
(617) 724-9725Acute Care Hospitals
NEWTON-WELLESLEY HOSPITAL2014 WASHINGTON STREET
NEWTON, MA 02462
(617) 243-6000Acute Care Hospitals
BRIGHAM AND WOMEN'S HOSPITAL75 FRANCIS STREET
BOSTON, MA 02115
(617) 732-5500Acute Care Hospitals

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1801870910, we treat the final digit (0) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
0
Doubled → 0
Pos 4
1
Unchanged
Pos 5
8
Doubled → 16 → 1 + 6
Pos 6
7
Unchanged
Pos 7
0
Doubled → 0
Pos 8
9
Unchanged
Pos 9
1
Doubled → 2
Check
0
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 0 → 0 8 → 16 → 7 0 → 0 1 → 2

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 0 + 1 + 1 + 6 + 7 + 0 + 9 + 2 + 24 = 60

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 60 is 60. The difference is the calculated check digit.

60 - 60 = 0
This NPI is valid
The calculated check digit is 0, which matches the last digit of 1801870910.

Other Providers at the Same Location


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

Pediatrics
55 FRUIT STREET, YAWKEY 5-062 MASSACHUSETTS GENERAL HOSPITAL
BOSTON, MA 02114
Anesthesiology
55 FRUIT STREET, CLN 309
BOSTON, MA 02114
Anesthesiology
55 FRUIT STREET, CLN 3
BOSTON, MA 02114
Anesthesiology
55 FRUIT STREET, CLN 3
BOSTON, MA 02114
Urology (Pediatric Urology)
55 FRUIT STREET, WRN 11
BOSTON, MA 02114
Anesthesiology
55 FRUIT STREET, GRB 406E
BOSTON, MA 02114
Psychiatry & Neurology (Psychiatry)
55 FRUIT STREET, WHT 130
BOSTON, MA 02114
Radiology (Diagnostic Radiology)
55 FRUIT STREET, FND 216 RADIOLOGICAL ASSOCIATES
BOSTON, MA 02114
Internal Medicine
55 FRUIT STREET, BAR 917 MEDICAL ACCESS UNIT
BOSTON, MA 02114
Anesthesiology
55 FRUIT STREET, CLN 309
BOSTON, MA 02114
Internal Medicine (Medical Oncology)
55 FRUIT STREET, YAW 7B HEMATOLOGY/ONCOLOGY
BOSTON, MA 02114
Psychiatry & Neurology (Psychiatry)
55 FRUIT STREET, YAW 6900 CHILD & ADOLESCENT PSYCHIATRY
BOSTON, MA 02114
Anesthesiology (Critical Care Medicine)
55 FRUIT STREET, CLN 2 ANESTHESIA ASSOCIATES
BOSTON, MA 02114
Internal Medicine (Cardiovascular Disease)
55 FRUIT STREET, VBK 508
BOSTON, MA 02114
Pathology (Anatomic Pathology & Clinical Pathology)
55 FRUIT STREET, MASSACHUSETTS GENERAL HOSPITAL WRN 219
BOSTON, MA 02114
Pathology (Anatomic Pathology & Clinical Pathology)
55 FRUIT STREET, WRN 2 PATHOLOGY ASSOCIATES
BOSTON, MA 02114
Psychiatry & Neurology (Neurology)
55 FRUIT STREET, VBK 915
BOSTON, MA 02114
Advanced Practice Midwife
55 FRUIT STREET, YAW 4
BOSTON, MA 02114
Advanced Practice Midwife
55 FRUIT STREET, YAW 4
BOSTON, MA 02114
Advanced Practice Midwife
55 FRUIT STREET, YAW 4
BOSTON, MA 02114

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1801870910, enumerated 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.

Pathology with taxonomy code 207ZI0100X and a focus in Immunopathology.

The provider might be accepting Accepts: Medicare, Medicaid, Blue Cross Blue Shield and. Please consult your insurance carrier or call the provider to verify.

Rex Smith is affiliated with: MASSACHUSETTS GENERAL HOSPITAL, NEWTON-WELLESLEY HOSPITAL and BRIGHAM AND WOMEN'S HOSPITAL.