DR. ALEXANDER CHRISTAKIS M.D.
NPI 1538512231
Pathology - Anatomic Pathology & Clinical Pathology in Boston, MA

Q: What is Alexander Christakis's NPI number?

The NPI number for Alexander Christakis is 1538512231. It was assigned to this individual provider in the NPPES registry on July 18, 2016.

Q: What is Alexander Christakis's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Active since July 18, 2016PECOS EnrolledAccepts Medicare Assignment

75 FRANCIS ST, BOSTON, MA 02115(617) 732-5500 Get Directions Write a Review

NPPES record last updated: April 2, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 2, 2026, Apr 8, 2021, Jan 7, 2021 (3 updates tracked since 2021).

On this page

About Dr. Alexander Christakis M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ALEXANDER CHRISTAKIS M.D. (NPI 1538512231) is an individual anatomic pathology & clinical pathology provider in Boston, Massachusetts, licensed in Massachusetts (278394) and active in the NPI registry since July 2016. He is enrolled in Medicare PECOS, is affiliated with Metrowest Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1538512231

Entity TypeIndividualMale

Primary Taxonomy207ZP0102X

Provider Legal NameDR. ALEXANDER CHRISTAKISCredential: M.D.

Location Address75 FRANCIS STBoston, MA 02115-6110

Mailing Address75 Francis Street, Brigham And Women's HospitalBoston, MA 02115 · (617) 732-7510

Phone(617) 732-5500

Sole ProprietorNo

Medical School CMSUniversity Of Massachusetts Medical SchoolGraduated 2016

Enumeration DateJuly 18, 2016

Last NPPES UpdateApril 2, 20263 updates tracked since enumeration

NPPES CertifiedApril 2, 2026

✔ NPI 1538512231 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZP0102X

Licenses✔ Licensed in MA · 278394✔ Licensed in MA · 267112✔ Licensed in RI · MD17375

Definition

A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

75 FRANCIS ST, Boston, MA 02115

Open in Google Maps ↗

Secondary Practice Locations 2

Location 11290 Silas Deane Hwy Ste 101Wethersfield, CT 06109-4337 · Phone (860) 859-9061 · Fax (860) 889-6200

Location 2110 Clock Tower Sq Ste 100Portsmouth, RI 02871-1396 · Phone (401) 293-5600

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Alexander Christakis M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5092000240

PECOS Enrollment IDI20210119002272, I20240822000695

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Alexander Christakis reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Brigham & Womens Physicians Organization Inc

0.1 mi

Internal Medicine

75 FRANCIS ST
Boston, MA 02115

Reassigned Medicare billing, Massachusetts enrollment
4,574 clinicians in this Medicare group

NPI 1033535497 (617) 732-5500

Metrowest Pathology Associates

16 mi

Anatomic Pathology & Clinical Pathology

115 LINCOLN ST, FRAMINGHAM UNION CAMPUS
Framingham, MA 01702

Reassigned Medicare billing, Massachusetts enrollment
10 clinicians in this Medicare group

NPI 1790890077 (508) 383-1091

Gbgastro LLC

17 mi

Gastroenterology

475 FRANKLIN ST STE 110
Framingham, MA 01702

Reassigned Medicare billing, Massachusetts enrollment
40 clinicians in this Medicare group

NPI 1033693023 (508) 620-9200

Greater Boston Gastroenterology

17 mi

Gastroenterology

475 FRANKLIN ST, SUITE 110
Framingham, MA 01702

Reassigned Medicare billing, Massachusetts enrollment
37 clinicians in this Medicare group

NPI 1164498796 (508) 620-9200

University Gastroenterology, LLC

40 mi

Gastroenterology

33 STANIFORD ST
Providence, RI 02905

Reassigned Medicare billing, Rhode Island enrollment
141 clinicians in this Medicare group

NPI 1386952612 (401) 421-8800

Connecticut Gi PLLC

90 mi

Gastroenterology

85 SEYMOUR ST, 1000
Hartford, CT 06106

Reassigned Medicare billing, Connecticut enrollment
417 clinicians in this Medicare group

NPI 1023124625 (860) 246-2571

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 22

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Pathology examination of tissue using a microscope, intermediate complexity 88305

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.

1,580 services590 patients

Pathology examination of tissue using a microscope, intermediate complexity 88305

291 services102 patients

Special stained specimen slides to examine tissue, initial procedure 88342

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.

222 services185 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count 85025

A Complete Blood Cell Count is a common test that measures various components of the blood, including red cells (carry oxygen), white cells (fight infection), and platelets (help blood clot). An automated test ensures accuracy. The differential count provides detailed information about white cell types.

127 services115 patients

Blood test, comprehensive group of blood chemicals 80053

A comprehensive group of blood chemicals test, also known as a comprehensive metabolic panel, is a blood test that measures your sugar level, electrolyte and fluid balance, kidney function, and liver function. This helps to check your body's overall health.

104 services98 patients

Special stained specimen slides to examine tissue, initial procedure 88342

83 services68 patients

Special stained specimen slides to examine tissue, each additional procedure 88341

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.

46 services19 patients

Iron binding capacity 83550

Iron binding capacity is a blood test that measures how well your body can bind and transport iron. This helps your healthcare provider assess if your body has too little or too much iron, which can indicate certain health conditions.

35 services34 patients

Special stained specimen slides to examine tissue including interpretation and report 88313

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.

33 services31 patients

Liver function blood test panel 80076

A liver function blood test panel helps check the health of your liver. It measures various proteins, liver enzymes, and bilirubin in your blood. If these levels are too high or too low, it could signal a liver problem. It's a simple, non-invasive test that involves drawing blood.

31 services31 patients

Special stained specimen slides to identify organisms including interpretation and report 88312

This service involves coloring specimen slides in a special way to help identify organisms. The colors make different parts of the organism stand out. Afterward, a detailed interpretation and report on the findings are provided.

28 services25 patients

Measurement c-reactive protein for detection of infection or inflammation 86140

C-reactive protein (CRP) test is a blood test that checks for signs of inflammation or infection in the body. High levels of CRP often suggest that there's inflammation or a bacterial infection. This test helps in monitoring and managing conditions like arthritis and heart disease.

24 services24 patients

Gammaglobulin (immune system protein) measurement 82784

Gammaglobulin measurement is a blood test that checks the levels of certain proteins (gammaglobulins) that the body uses to fight infections. High or low levels can indicate various health conditions. It's a simple, quick procedure with minimal discomfort.

23 services23 patients

Ferritin (blood protein) level 82728

A Ferritin level test measures the amount of ferritin, a protein that stores iron, in your blood. It helps determine how much iron your body is storing. If levels are low, it may indicate iron deficiency, while high levels could signify conditions like iron overload.

19 services18 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test 85027

A complete blood cell count (CBC) is an automated test that measures different components of the blood, including red cells, white cells, and platelets. It helps assess overall health, detect disorders like anemia or infection, and monitor medical treatments.

19 services16 patients

Iron level 83540

An iron level test measures the amount of iron in your blood. Iron is crucial for producing hemoglobin, a protein in red blood cells that carries oxygen throughout your body. This test helps identify iron deficiencies or excesses, which can lead to conditions like anemia or hemochromatosis.

18 services17 patients

Blood creatinine level 82565

A blood creatinine level test measures the amount of creatinine in your blood. Creatinine is a waste product that your body produces when it uses energy. High levels may indicate that your kidneys aren't working properly. This test is often used to monitor kidney health.

12 services12 patients

Urea nitrogen level to assess kidney function, quantitative 84520

The urea nitrogen level test is a routine blood test that checks the amount of urea nitrogen in your blood to evaluate how well your kidneys are working. If the levels are higher than normal, it may indicate that your kidneys are not functioning properly.

12 services12 patients

Hepatitis c antibody measurement 86803

Hepatitis C antibody measurement is a blood test to check if you have been exposed to the Hepatitis C virus. This virus affects your liver. If the test is positive, it means you have had the virus at some point. Additional tests are needed to determine if the virus is currently active.

12 services12 patients

Detection test by immunoassay technique for hepatitis b surface antigen 87340

This test helps identify the presence of hepatitis B in your body. It uses an immunoassay technique, which is a highly sensitive method that detects the hepatitis B surface antigen, a protein on the virus. This test can help diagnose an active infection or determine if you're a carrier.

12 services12 patients

Alpha-fetoprotein (afp) level, serum 82105

An Alpha-fetoprotein (AFP) level, serum test is a blood test that measures the amount of AFP in your blood. AFP is a protein normally made by the liver and yolk sac of a fetus. High levels can indicate certain health conditions.

11 services11 patients

Hepatitis b surface antibody measurement 86706

Hepatitis B surface antibody measurement is a blood test done to check if your body has developed immunity against the Hepatitis B virus. It's typically done after vaccination or to confirm recovery from a past infection. It's a simple, safe procedure.

11 services11 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Metrowest Medical Center

Acute Care Hospitals · Framingham, MA

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220175

Location115 Lincoln StreetFramingham, MA 01701 · Middlesex County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$144.11 typical visit price

range $63.72 – $189.86

Typical copayment $36.02 (range $15.93 – $47.46)

Most-billed visit code 99204

Established Patient

$111.18 typical visit price

range $21.07 – $155.29

Typical copayment $27.79 (range $5.26 – $38.82)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

RUMA RAJBHANDARI

Internal Medicine (Gastroenterology)

75 FRANCIS ST
BOSTON, MA 02115

Suffolk County (617) 525-6841

WENYA LINDA BI

Neurological Surgery

75 FRANCIS ST
BOSTON, MA 02115

Suffolk County (203) 645-9485

CHI YUEN CHAN M.D.

Student in an Organized Health Care Education/Training Program

75 FRANCIS ST
BOSTON, MA 02115

Suffolk County (617) 732-5500

JENNIFER MICHELLE THOMAS MD

Radiology (Diagnostic Radiology)

75 FRANCIS ST, DEPARTMENT OF RADIOLOGY
BOSTON, MA 02115

Suffolk County (617) 732-6248

GAURAV SHARMA M.D.

Surgery (Vascular Surgery)

75 FRANCIS ST, BRIGHAM AND WOMEN'S HOSPITAL
BOSTON, MA 02115

Suffolk County (951) 259-0890

YEU-SHIN CINDY CHANG M.D., M.P.H.

Emergency Medicine

75 FRANCIS ST, BWH DEPT. OF EMERGENCY MEDICINE
BOSTON, MA 02115

Suffolk County (617) 732-8070

CARA L RICHARDS

Physician Assistant

75 FRANCIS ST
BOSTON, MA 02115

Suffolk County (617) 732-5500

LARA COAKLEY

Nurse Practitioner (Family)

75 FRANCIS ST
BOSTON, MA 02115

Suffolk County (617) 732-5500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alexander Christakis's NPI number?

The NPI number for Alexander Christakis is 1538512231. It was assigned to this individual provider in the NPPES registry on July 18, 2016.

Where is Alexander Christakis located?

Alexander Christakis practices at 75 Francis St, Boston, MA 02115. The listed phone number is (617) 732-5500.

What is Alexander Christakis's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Alexander Christakis enrolled in Medicare?

Yes. Alexander Christakis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Alexander Christakis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Christakis reassigns Medicare benefits to 6 organizations: Brigham & Womens Physicians Organization Inc (Boston, MA), Metrowest Pathology Associates (Framingham, MA), Gbgastro LLC (Framingham, MA), Greater Boston Gastroenterology (Framingham, MA), University Gastroenterology, LLC (Providence, RI) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alexander Christakis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Alexander Christakis affiliated with any hospitals?

According to CMS data, Alexander Christakis is affiliated with Metrowest Medical Center.

When was this NPI record last updated?

The NPPES record for Alexander Christakis was last updated on April 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.