Michael Ambrose, MD
NPI 1538398680 · Internal Medicine Physician · Mount Vernon, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Ambrose, MD is a Internal Medicine Physician provider in Mount Vernon, IL (NPI 1538398680).
Provider details
- NPI number
- 1538398680
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 038010043 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Chiropractic Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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) | Beneficiaries |
|---|---|---|
| Progesterone, Micronizedbrand: Progesterone | 52 | 23 |
| Levothyroxine Sodium | 34 | — |
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)
- 605 N 12th StMount Vernon, IL 62864-2857Phone: (618) 241-2212Fax: (618) 241-2508
Registry dates
- Enumerated
- 2009-07-10
- Last updated
- 2021-03-25
- Certified
- 2021-03-25
Frequently asked questions
- What is Michael Ambrose's NPI number?
- Michael Ambrose's National Provider Identifier (NPI) is 1538398680, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Ambrose's specialty?
- Michael Ambrose is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Ambrose located?
- Michael Ambrose's practice location on file with NPPES is 605 N 12th St, Mount Vernon, IL 62864.
- What is Michael Ambrose's phone number?
- The practice phone number listed in the NPPES registry for Michael Ambrose is (618) 241-2212.
- Does Michael Ambrose accept Medicare?
- Michael Ambrose is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Ambrose's NPI active?
- Yes — Michael Ambrose's NPI (1538398680) is active in the NPPES registry as of the last update on 2021-03-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.