Peter Mayock, M.D.
NPI 1285735142 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Mayock, M.D. is a Internal Medicine Physician provider in Chicago, IL (NPI 1285735142).
Provider details
- NPI number
- 1285735142
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036084492 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% 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 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 273 | 62 |
| Metformin Hcl | 162 | 26 |
| Amlodipine Besylate | 117 | 28 |
| Hydrochlorothiazide | 90 | 15 |
| Empagliflozinbrand: Jardiance | 89 | 15 |
| Levothyroxine Sodium | 84 | 11 |
| Famotidine | 80 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-25
- Last updated
- 2022-02-23
- Certified
- 2022-02-23
Frequently asked questions
- What is Peter Mayock's NPI number?
- Peter Mayock's National Provider Identifier (NPI) is 1285735142, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Mayock's specialty?
- Peter Mayock is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Peter Mayock located?
- Peter Mayock's practice location on file with NPPES is 845 W Wilson Ave, Chicago, IL 60640-8090.
- What is Peter Mayock's phone number?
- The practice phone number listed in the NPPES registry for Peter Mayock is (773) 506-4283.
- Does Peter Mayock accept Medicare?
- Peter Mayock is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Mayock's NPI active?
- Yes — Peter Mayock's NPI (1285735142) is active in the NPPES registry as of the last update on 2022-02-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.