William Douglas Farmer, M.D.
Internal Medicine Physician · Hamden, CT
William Douglas Farmer, M.D. is an internal medicine physician with a practice address in Hamden, Connecticut, and NPI 1689660771, issued on Sep 23, 2005. Check the license (Connecticut 038805, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- William Douglas Farmer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 038805 CT
Self-reported in NPPES; status is on the state search - Practice location
- 2447 Whitney Ave, Hamden, CT 06518
- Phone
- (203) 230-5888
- Enumerated
- Sep 23, 2005
- Record last updated
- Oct 2, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (203) 230-5889
- Medicare enrollment
- Enrolled (PECOS I20040322000861); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 2447 Whitney Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kevin Hunt, MDAllergy Physician1225106867
- Ernest Scarnati, MDDiagnostic Radiology Physician1689601528
Verify William Douglas Farmer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 038805Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,911 Medicare Part D claims for 143 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Atorvastatin Calcium166 claims
- Rosuvastatin Calcium156 claims
- Levothyroxine Sodium152 claims
- Montelukast Sodium93 claims
- Methylprednisolone85 claims
- Olmesartan Medoxomil84 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: $147.34
5 payments; by number, the most common kind was food and beverage; the largest payer was Aimmune Therapeutics, 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.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William Douglas Farmer among 2,623 internal medicine physician records in Connecticut
William Douglas Farmer, M.D. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1996 · median 2004 among the 1,646 with a school on file
- Record last updated2013 · 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 Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
35 internal medicine physician records list a practice address in Hamden
They are 35 of the 1,410 NPPES records with a practice address in Hamden, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Hamden → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alina Alfirii, MDHamden, CT 065181487687570
- Renu Bazaz-Kapoor, DOHamden, CT 065181427045954
- Karen Brown, M.D.Hamden, CT 065181285609412
- Sunita Chhabra, M.D.Hamden, CT 065181568496552
- Paul Clarke, M.D.Hamden, CT 065181548292279
- Holly Craig, M.D.Hamden, CT 065181942275557
- Garumuni Desilva, M.D.Hamden, CT 065181275539892
- Marc Mann, M.D.Hamden, CT 065181205800711
Common questions
What is William Douglas Farmer, M.D.'s NPI number?
William Douglas Farmer, M.D.'s National Provider Identifier (NPI) is 1689660771, issued on Sep 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Douglas Farmer, M.D. located?
The NPPES record lists a practice address at 2447 Whitney Ave, Hamden, CT, 06518. Phone: (203) 230-5888. Providers update this record themselves, so call before visiting.
How can I verify William Douglas Farmer, M.D.'s license?
NPPES lists Connecticut license number 038805, 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 William Douglas Farmer, M.D. prescribe under Medicare Part D?
In 2024, William Douglas Farmer, M.D. had 2,911 Medicare Part D claims for 143 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.
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.