William Farmer, M.D.
NPI 1689660771 · Internal Medicine Physician · Hamden, CT
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Farmer, M.D. is a Internal Medicine Physician provider in Hamden, CT (NPI 1689660771).
Provider details
- NPI number
- 1689660771
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 038805 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
292 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 116 | $188 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 76 | $95 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 49 | $134 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 19 | $15 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 16 | $9 |
| Test to Measure Expiratory Airflow and Volume |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 64 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 166 | 45 |
| Rosuvastatin Calcium | 156 | 46 |
| Levothyroxine Sodium | 152 | 39 |
| Montelukast Sodium | 93 | 32 |
| Methylprednisolone | 85 | 57 |
| Olmesartan Medoxomil | 84 | 28 |
| Amlodipine Besylate | 76 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$147 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-23
- Last updated
- 2013-10-02
Frequently asked questions
- What is William Farmer's NPI number?
- William Farmer's National Provider Identifier (NPI) is 1689660771, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Farmer's specialty?
- William Farmer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Farmer located?
- William Farmer's practice location on file with NPPES is 2447 Whitney Ave, Hamden, CT 06518-3211.
- What is William Farmer's phone number?
- The practice phone number listed in the NPPES registry for William Farmer is (203) 230-5888.
- Does William Farmer accept Medicare?
- William Farmer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Farmer's NPI active?
- Yes — William Farmer's NPI (1689660771) is active in the NPPES registry as of the last update on 2013-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.