William Grigg, D.O.
NPI 1578050266 · Internal Medicine Physician · Rochester, NY
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Grigg, D.O. is a Internal Medicine Physician provider in Rochester, NY (NPI 1578050266).
Provider details
- NPI number
- 1578050266
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- TL.0007279 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 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
66 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 48 | $170 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 18 | $128 |
Typical Medicare-allowed amounts for these services range $128–$170 (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 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 29 | — |
| Clonazepam | 28 | — |
| Metoprolol Succinate | 26 | 13 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 25 | — |
| Rosuvastatin Calcium | 24 | — |
| Alprazolam | 20 | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,229 across 19 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
- 2018-04-18
- Last updated
- 2024-07-22
- Certified
- 2022-01-26
Frequently asked questions
- What is William Grigg's NPI number?
- William Grigg's National Provider Identifier (NPI) is 1578050266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Grigg's specialty?
- William Grigg is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Grigg located?
- William Grigg's practice location on file with NPPES is 601 Elmwood Avenue, Rochester, NY 14642.
- What is William Grigg's phone number?
- The practice phone number listed in the NPPES registry for William Grigg is (858) 275-4290.
- Does William Grigg accept Medicare?
- William Grigg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Grigg's NPI active?
- Yes — William Grigg's NPI (1578050266) is active in the NPPES registry as of the last update on 2024-07-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.