James Riddell, MD
NPI 1205911161 · Infectious Disease Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Riddell, MD is a Infectious Disease Physician provider in Ann Arbor, MI (NPI 1205911161).
Provider details
- NPI number
- 1205911161
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301063507 (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
95 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 58 | $98 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 37 | $17 |
Typical Medicare-allowed amounts for these services range $17–$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 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 249 | 25 |
| Dolutegravir Sodiumbrand: Tivicay | 108 | 12 |
| Darunavir/Cob/Emtri/Tenof Alafbrand: Symtuza | 91 | — |
| Darunavir/Cobicistatbrand: Prezcobix | 68 | — |
| Emtricitabine/Tenofov Alafenambrand: Descovy | 68 | — |
| Emtricitab/Rilpiviri/Tenof Alabrand: Odefsey | 52 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-26
- Last updated
- 2025-11-25
- Certified
- 2025-11-25
Frequently asked questions
- What is James Riddell's NPI number?
- James Riddell's National Provider Identifier (NPI) is 1205911161, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Riddell's specialty?
- James Riddell is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is James Riddell located?
- James Riddell's practice location on file with NPPES is 1500 E Medical Center Dr, Ann Arbor, MI 48109-5000.
- What is James Riddell's phone number?
- The practice phone number listed in the NPPES registry for James Riddell is (734) 936-4000.
- Does James Riddell accept Medicare?
- James Riddell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Riddell's NPI active?
- Yes — James Riddell's NPI (1205911161) is active in the NPPES registry as of the last update on 2025-11-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.