William Grossman, MD
NPI 1134178478 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grossman, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1134178478).
Provider details
- NPI number
- 1134178478
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G83785 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
210 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 111 | $162 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 99 | $19 |
Typical Medicare-allowed amounts for these services range $19–$162 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 102 | 31 |
| Apixabanbrand: Eliquis | 63 | 14 |
| Metoprolol Succinate | 61 | 19 |
| Ezetimibe | 59 | 15 |
| Amlodipine Besylate | 51 | 19 |
| Atorvastatin Calcium | 48 | 12 |
| Spironolactone |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-06
- Last updated
- 2008-06-06
Frequently asked questions
- What is William Grossman's NPI number?
- William Grossman's National Provider Identifier (NPI) is 1134178478, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grossman's specialty?
- William Grossman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Grossman located?
- William Grossman's practice location on file with NPPES is 350 Parnassus Ave, San Francisco, CA 94143-0001.
- What is William Grossman's phone number?
- The practice phone number listed in the NPPES registry for William Grossman is (415) 476-4144.
- Does William Grossman accept Medicare?
- William Grossman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grossman's NPI active?
- Yes — William Grossman's NPI (1134178478) is active in the NPPES registry as of the last update on 2008-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.