John Wiley, MD
NPI 1164507778 · Gastroenterology Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Wiley, MD is a Gastroenterology Physician provider in Ann Arbor, MI (NPI 1164507778).
Provider details
- NPI number
- 1164507778
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301044428 (MI)
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 tenure28% of score
19 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
12 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) |
|---|---|---|
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 12 | $98 |
Typical Medicare-allowed amounts for these services range $98–$98 (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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 26 | 11 |
| Linaclotidebrand: Linzess | 22 | — |
| Ondansetronbrand: Ondansetron Odt | 20 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 17 | — |
| Prucalopride Succinatebrand: Motegrity | 16 | — |
| Omeprazole | 16 | — |
| Loperamide Hclbrand: Loperamide | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2012-04-04
Frequently asked questions
- What is John Wiley's NPI number?
- John Wiley's National Provider Identifier (NPI) is 1164507778, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Wiley's specialty?
- John Wiley is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Wiley located?
- John Wiley's practice location on file with NPPES is 1500 East Medical Center Dr, Ann Arbor, MI 48109-5362.
- What is John Wiley's phone number?
- The practice phone number listed in the NPPES registry for John Wiley is (734) 647-5944.
- Does John Wiley accept Medicare?
- John Wiley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Wiley's NPI active?
- Yes — John Wiley's NPI (1164507778) is active in the NPPES registry as of the last update on 2012-04-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.