Gregory C. Mahr, M.D.
Psychiatry Physician · Ferndale, MI
Gregory C. Mahr, M.D. is a psychiatry physician with a practice address in Ferndale, Michigan, and NPI 1841350717, issued on Dec 11, 2006. Check the license (Michigan 4301047989, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Gregory C. Mahr
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 4301047989 MI
Self-reported in NPPES; status is on the state search - Practice location
- Kingswood Hospital, Ferndale, MI 48220
- Phone
- (248) 691-4865
- Enumerated
- Dec 11, 2006
- Record last updated
- Jul 31, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (248) 691-4877
- Medicaid ID
- 309201510 MI
- Medicare enrollment
- Enrolled (PECOS I20080429000246); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 1,729 in Michigan → Look up another NPI →
Verify Gregory C. Mahr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301047989Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average psychiatry physician in 2024
428 Medicare Part D claims for 37 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims. 18 claims were for opioids.
Most prescribed
- Alprazolam83 claims
- Quetiapine Fumarate37 claims
- Buspirone Hcl35 claims
- Lorazepam31 claims
- Fluoxetine Hcl18 claims
- Zolpidem Tartrate16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Henry Ford Health SystemDetroit, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory C. Mahr among 1,729 psychiatry physician records in Michigan
Gregory C. Mahr, M.D. is one of 1,729 psychiatry physician records with a practice address in Michigan. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 63% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 48% of these records are
- Graduated1983 · median 2005 among the 828 with a school on file
- Record last updated2018 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 psychiatry physician records list a practice address in Ferndale
They are 8 of the 487 NPPES records with a practice address in Ferndale, and 1,729 psychiatry physician records in Michigan.
All 1,729 in Michigan → Every provider in Ferndale → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Lindsey Gifford, DOFerndale, MI 482201548750581
- Faraz Khan, MDFerndale, MI 482201073171047
- Shameer Mehdikhan, MDFerndale, MI 482201629634878
- Alejandra Munoz, MDFerndale, MI 482201831752344
- Lisa Spurlock, MDFerndale, MI 482201881860658
- Derek StodolakFerndale, MI 482201689235459
- Maria Villafuerte, D.O.Ferndale, MI 482201659576718
- Stephanie Stevenson, M.D.Detroit, MI 482191659456184
Common questions
What is Gregory C. Mahr, M.D.'s NPI number?
Gregory C. Mahr, M.D.'s National Provider Identifier (NPI) is 1841350717, issued on Dec 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory C. Mahr, M.D. located?
The NPPES record lists a practice address at Kingswood Hospital, Ferndale, MI, 48220. Phone: (248) 691-4865. Providers update this record themselves, so call before visiting.
How can I verify Gregory C. Mahr, M.D.'s license?
NPPES lists Michigan license number 4301047989, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory C. Mahr, M.D. prescribe under Medicare Part D?
In 2024, Gregory C. Mahr, M.D. had 428 Medicare Part D claims for 37 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.