William Amess, M.D.
NPI 1326232794 · Internal Medicine Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Amess, M.D. is a Internal Medicine Physician provider in Sacramento, CA (NPI 1326232794).
Provider details
- NPI number
- 1326232794
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A101329 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 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
48 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) |
|---|---|---|
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 48 | $10 |
Typical Medicare-allowed amounts for these services range $10–$10 (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 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 409 | 122 |
| Methimazole | 199 | 102 |
| Insulin Glargine-Yfgn | 136 | 62 |
| Hydrocortisone | 125 | 41 |
| Cinacalcet Hcl | 119 | 34 |
| Insulin Lisprobrand: Humalog | 76 | 31 |
| Insulin Lisprobrand: Humalog Kwikpen U-100 | 60 | 28 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-29
- Last updated
- 2021-12-15
Frequently asked questions
- What is William Amess's NPI number?
- William Amess's National Provider Identifier (NPI) is 1326232794, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Amess's specialty?
- William Amess is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Amess located?
- William Amess's practice location on file with NPPES is 4860 Y St Ste B0400, Sacramento, CA 95817-2307.
- What is William Amess's phone number?
- The practice phone number listed in the NPPES registry for William Amess is (916) 734-2737.
- Does William Amess accept Medicare?
- William Amess is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Amess's NPI active?
- Yes — William Amess's NPI (1326232794) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.