William Haffner, MD
NPI 1033853056 · Family Medicine Physician · Winchester, VA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Haffner, MD is a Family Medicine Physician provider in Winchester, VA (NPI 1033853056).
Provider details
- NPI number
- 1033853056
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 0101287427 (VA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 13 |
| Losartan Potassium | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 1840 Amherst StWinchester, VA 22601-2808Phone: (540) 536-8000Fax: (540) 536-7780
Registry dates
- Enumerated
- 2022-04-26
- Last updated
- 2025-12-03
- Certified
- 2025-12-03
Frequently asked questions
- What is William Haffner's NPI number?
- William Haffner's National Provider Identifier (NPI) is 1033853056, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Haffner's specialty?
- William Haffner is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Haffner located?
- William Haffner's practice location on file with NPPES is 217 Grocery Ave Ste B, Winchester, VA 22602-8934.
- What is William Haffner's phone number?
- The practice phone number listed in the NPPES registry for William Haffner is (540) 536-7700.
- Does William Haffner accept Medicare?
- William Haffner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Haffner's NPI active?
- Yes — William Haffner's NPI (1033853056) is active in the NPPES registry as of the last update on 2025-12-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.