NPPES file of Aug 9, 2026

James Christopher O'Brien, M.D.

Sleep Medicine (Internal Medicine) Physician · Farmington, CT

James Christopher O'Brien, M.D. is a sleep medicine (internal medicine) physician with a practice address in Farmington, Connecticut, and NPI 1962465070, issued on Apr 10, 2006. Check the license (Connecticut 044652, as entered in NPPES) on the Connecticut Medical Examining Board; 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
1962465070
Name
James Christopher O'Brien
Credential
M.D.
Primary taxonomy
Sleep Medicine (Internal Medicine) Physician 207RS0012X
License numbers
044652 CT
40480 MA
Self-reported in NPPES; status is on the state search
Practice location
599 Farmington Ave, Farmington, CT 06032
Phone
(860) 284-4950
Enumerated
Apr 10, 2006
Record last updated
Apr 9, 2024
Fax
(781) 290-0720
Medicaid ID
0128783 MA
Medicare enrollment
Enrolled (PECOS I20061215000359); accepts Medicare assignment
Medical or professional school
New York Medical College, 1975
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.
Download card Updates feed

8 nearest sleep medicine (internal medicine) physician records → All 18 in Connecticut → Look up another NPI →

Also registered at 599 Farmington Ave

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

  1. Biancha Barton, FNPFamily Nurse Practitioner1932863636
  2. Alyssa Bennett, M.D.Pediatrics Physician1053637389
  3. Seth Brown, MDOtolaryngology Physician1679611701
  4. Fatema Islam, MDFamily Medicine Physician1265538516
  5. Rachael Marcano, FNPFamily Nurse Practitioner1861146003
  6. Erika MatosOptician1134915218

Verify James Christopher O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersConnecticut Medical Examining Board
    Search for license 044652    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 Connecticut license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

96% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024

23 Medicare Part D claims for 11 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D.

  1. James O'Brien23
  2. Specialty average585

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: $63.38

1 payment: food and beverage; the largest payer was Itamar Medical Inc. The 664 providers of this specialty with any payment received $3,724.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. James O'Brien$63.38
  2. Specialty average$3,724.37

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. Ear Nose And Throat Institute OF Connecticut PLLCFarmington, CT

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

James Christopher O'Brien among 18 sleep medicine (internal medicine) physician records in Connecticut

James Christopher O'Brien, M.D. is one of 18 sleep medicine (internal medicine) physician records with a practice address in Connecticut. 89% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 17% of them.

  • NPI issued2006 · 17% of these records are older, 39% newer
  • In a Medicare fileYes · 89% of these records are
  • In the CMS Doctors and Clinicians fileYes · 72% of these records are
  • Graduated1975 · median 2000 among the 13 with a school on file
  • Record last updated2024 · 44% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RS0012X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Sleep Medicine (Internal Medicine) Physician providers in Connecticut

There are 18 sleep medicine (internal medicine) physician records in Connecticut.

All 18 in Connecticut → Every provider in Farmington → Sleep Medicine (Internal Medicine) Physician nationwide →

The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes

  1. Jay Kenkare, MDFarmington, CT 060321619940996
  2. Mian Iftikhar, M.D.Farmington, CT 060301841642659
  3. Daniel McNally, MDFarmington, CT 060301497751408
  4. Richard Shoup, MDManchester, CT 060401518930957
  5. Keith Dixon, M.D.Hartford, CT 061061982606810
  6. Irina Petrenko, M.D.Middletown, CT 064571982864740
  7. Vivian Asare, M.D.North Haven, CT 064731700106002
  8. Parvati Singh, MDNorth Haven, CT 064731154718161

Common questions

What is James Christopher O'Brien, M.D.'s NPI number?

James Christopher O'Brien, M.D.'s National Provider Identifier (NPI) is 1962465070, issued on Apr 10, 2006. An NPI identifies a provider in billing; it is not a license.

Where is James Christopher O'Brien, M.D. located?

The NPPES record lists a practice address at 599 Farmington Ave, Farmington, CT, 06032. Phone: (860) 284-4950. Providers update this record themselves, so call before visiting.

How can I verify James Christopher O'Brien, M.D.'s license?

NPPES lists Connecticut license number 044652, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does James Christopher O'Brien, M.D. prescribe under Medicare Part D?

In 2024, James Christopher O'Brien, M.D. had 23 Medicare Part D claims for 11 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.