Michael Williams, D.O.
NPI 1851353247 · Family Medicine Physician · O'Fallon, MO
Michael Williams, D.O. is a Family Medicine Physician provider in O'Fallon, MO (NPI 1851353247).
Provider details
- NPI number
- 1851353247
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A18065 (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 tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 14 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Levothyroxine Sodium | 31 |
| Trazodone Hcl | 18 |
| Olmesartan Medoxomil | 17 |
| Progesterone, Micronizedbrand: Progesterone | 15 |
| Rosuvastatin Calcium | 15 |
| Clonazepam | 13 |
| Ezetimibe | 13 |
| Losartan Potassium | 13 |
| Telmisartan | 13 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$112 across 6 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
Additional practice locations (2)
- 7421 Highway NDardenne Prairie, MO 63368-7014Phone: (636) 561-5699Fax: (636) 669-2401
- 400 Medical Plz Ste 200Lake St Louis, MO 63367-1417Phone: (636) 625-2662
Registry dates
- Enumerated
- 2006-04-03
- Last updated
- 2022-09-23
- Certified
- 2022-09-20
Frequently asked questions
- What is Michael Williams's NPI number?
- Michael Williams's National Provider Identifier (NPI) is 1851353247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Williams's specialty?
- Michael Williams is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Williams located?
- Michael Williams's practice location on file with NPPES is Ultra Wellness Medical, LLC, O'Fallon, MO 63368.
- What is Michael Williams's phone number?
- The practice phone number listed in the NPPES registry for Michael Williams is (636) 333-9820.
- Is Michael Williams's NPI active?
- Yes — Michael Williams's NPI (1851353247) is active in the NPPES registry as of the last update on 2022-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.