Gregory Mahr, M.D.
NPI 1841350717 · Psychiatry Physician · Ferndale, MI
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Mahr, M.D. is a Psychiatry Physician provider in Ferndale, MI (NPI 1841350717).
Provider details
- NPI number
- 1841350717
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301047989 (MI)
Specialties & taxonomies
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
143 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) |
|---|---|---|
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 76 | $170 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 32 | $132 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 23 | $79 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 12 | $50 |
Typical Medicare-allowed amounts for these services range $50–$170 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 83 | 12 |
| Quetiapine Fumarate | 37 | — |
| Buspirone Hcl | 35 | — |
| Lorazepam | 31 | — |
| Fluoxetine Hcl | 18 | — |
| Zolpidem Tartrate | 16 | — |
| Escitalopram Oxalate | 15 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-11
- Last updated
- 2018-07-31
Frequently asked questions
- What is Gregory Mahr's NPI number?
- Gregory Mahr's National Provider Identifier (NPI) is 1841350717, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Mahr's specialty?
- Gregory Mahr is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Mahr located?
- Gregory Mahr's practice location on file with NPPES is Kingswood Hospital, Ferndale, MI 48220.
- What is Gregory Mahr's phone number?
- The practice phone number listed in the NPPES registry for Gregory Mahr is (248) 691-4865.
- Does Gregory Mahr accept Medicare?
- Gregory Mahr is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Mahr's NPI active?
- Yes — Gregory Mahr's NPI (1841350717) is active in the NPPES registry as of the last update on 2018-07-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.