NPPES file of Aug 9, 2026

Christopher Michael Brennan, M.D.

Internal Medicine Physician · West Islip, NY

Christopher Michael Brennan, M.D. is an internal medicine physician with a practice address in West Islip, New York, and NPI 1174771323, issued on Aug 29, 2008. Check the license (New York 277549, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1174771323
Name
Christopher Michael Brennan
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License numbers
277549 NY
246004 MA
MD13459 RI
Self-reported in NPPES; status is on the state search
Practice location
1000 Montauk Highway, West Islip, NY 11795
Phone
(631) 376-3610
Enumerated
Aug 29, 2008
Record last updated
May 19, 2025
Medicare enrollment
Enrolled (PECOS I20141208001067); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →

Also registered at 1000 Montauk Highway

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Louis Amblard, MDDiagnostic Radiology Physician1790752806
  2. Andrew Dorovenis, MDStudent in an Organized Health Care Education/Training Program1548007776
  3. Anne Green, MDDiagnostic Radiology Physician1861460503
  4. Heather Grooms, DOPediatrics Physician1235391202
  5. Jeffrey Gropper, DOAnesthesiology Physician1972544971
  6. Michael Hill, MBBCHDiagnostic Radiology Physician1265491914

Verify Christopher Michael Brennan in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
    Search for license 277549    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New York license search

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90% fewer Medicare Part D claims than the average internal medicine physician in 2024

302 Medicare Part D claims for 130 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.

  1. Christopher Brennan302
  2. Specialty average3,176

Most prescribed

  1. Cefpodoxime Proxetil38 claims
  2. Prednisone19 claims
  3. Pantoprazole Sodium17 claims
  4. Amlodipine Besylate12 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $308.10

10 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Christopher Brennan$308.10
  2. Specialty average$1,303.06

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Southwest Suffolk Medical PCWest Islip, NY

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Christopher Michael Brennan among 12,067 internal medicine physician records in New York

Christopher Michael Brennan, M.D. is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 56% of them.

  • NPI issued2008 · 56% of these records are older, 40% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 60% of these records are
  • Graduated2007 · median 2002 among the 7,221 with a school on file
  • Record last updated2025 · 61% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

23 internal medicine physician records list a practice address in West Islip

They are 23 of the 1,107 NPPES records with a practice address in West Islip, and 12,067 internal medicine physician records in New York.

All 12,067 in New York → Every provider in West Islip → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Sumeet Anand, MDWest Islip, NY 117951902896764
  2. Eleni Dilos, M.D.West Islip, NY 117951992700116
  3. Michael Gewirtz, MDWest Islip, NY 117951093739534
  4. Stuart Greenberg, M.D.West Islip, NY 117951043244130
  5. Thomas Hall, MDWest Islip, NY 117951356365803
  6. Abu Muhammad Haque, MDWest Islip, NY 117951588658512
  7. Gabriel Leonte, MDWest Islip, NY 117951144225350
  8. Anser Lone, M.D.West Islip, NY 117951407851637

Common questions

What is Christopher Michael Brennan, M.D.'s NPI number?

Christopher Michael Brennan, M.D.'s National Provider Identifier (NPI) is 1174771323, issued on Aug 29, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Christopher Michael Brennan, M.D. located?

The NPPES record lists a practice address at 1000 Montauk Highway, West Islip, NY, 11795. Phone: (631) 376-3610. Providers update this record themselves, so call before visiting.

How can I verify Christopher Michael Brennan, M.D.'s license?

NPPES lists New York license number 277549, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Christopher Michael Brennan, M.D. prescribe under Medicare Part D?

In 2024, Christopher Michael Brennan, M.D. had 302 Medicare Part D claims for 130 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.