Michael Mayer
NPI 1871175760 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Mayer is a Internal Medicine Physician provider in Chicago, IL (NPI 1871175760).
Provider details
- NPI number
- 1871175760
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 40 | 17 |
| Gabapentin | 27 | — |
| Amlodipine Besylate | 18 | — |
| Metformin Hcl | 15 | — |
| Oxycodone Myristatebrand: Xtampza Er | 15 | — |
| Spironolactone | 14 | — |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-21
- Last updated
- 2021-06-23
- Certified
- 2021-06-23
Frequently asked questions
- What is Michael Mayer's NPI number?
- Michael Mayer's National Provider Identifier (NPI) is 1871175760, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Mayer's specialty?
- Michael Mayer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Mayer located?
- Michael Mayer's practice location on file with NPPES is 5841 S. Maryland Ave., Chicago, IL 60637-1443.
- What is Michael Mayer's phone number?
- The practice phone number listed in the NPPES registry for Michael Mayer is (773) 702-6840.
- Does Michael Mayer accept Medicare?
- Michael Mayer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Mayer's NPI active?
- Yes — Michael Mayer's NPI (1871175760) is active in the NPPES registry as of the last update on 2021-06-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.