Joshua Nnanji, MD
NPI 1821291550 · Psychiatry Physician · Mason, MI
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joshua Nnanji, MD is a Psychiatry Physician provider in Mason, MI (NPI 1821291550).
Provider details
- NPI number
- 1821291550
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301091517 (MI)
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 · 24 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 75 | 26 |
| Trazodone Hcl | 46 | 19 |
| Aripiprazole | 37 | 12 |
| Bupropion Hclbrand: Bupropion Xl | 35 | 13 |
| Benztropine Mesylate | 33 | 14 |
| Clonazepam | 32 | 12 |
| Lamotrigine | 31 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-08
- Last updated
- 2011-02-11
Frequently asked questions
- What is Joshua Nnanji's NPI number?
- Joshua Nnanji's National Provider Identifier (NPI) is 1821291550, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joshua Nnanji's specialty?
- Joshua Nnanji is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Joshua Nnanji located?
- Joshua Nnanji's practice location on file with NPPES is 585 Jewett Rd, Mason, MI 48854-8729.
- What is Joshua Nnanji's phone number?
- The practice phone number listed in the NPPES registry for Joshua Nnanji is (517) 676-5405.
- Does Joshua Nnanji accept Medicare?
- Joshua Nnanji is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joshua Nnanji's NPI active?
- Yes — Joshua Nnanji's NPI (1821291550) is active in the NPPES registry as of the last update on 2011-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.