Gregory L. Penner, M.D.
Specialist · Brunswick, ME
Gregory L. Penner, M.D. is a specialist with a practice address in Brunswick, Maine, and NPI 1275610198, issued on Nov 1, 2006. Check the license (Maine 12949, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory L. Penner
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 12949 ME
Self-reported in NPPES; status is on the state search - Practice location
- 331 Maine St Ste 4, Brunswick, ME 04011
- Phone
- (207) 721-0911
- Enumerated
- Nov 1, 2006
- Record last updated
- Jun 22, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (207) 721-9729
- Medicaid ID
- 122050000 ME
- Medicare enrollment
- Enrolled (PECOS I20040310000106); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest specialist records → All 248 in Maine → Look up another NPI →
Also registered at 331 Maine St Ste 4
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michelle Barber, NPNurse Practitioner1407335789
- Peter O'Connor, M.D., O.D.Otolaryngology Physician1992805253
Verify Gregory L. Penner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license 12949Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% fewer Medicare Part D claims than the average specialist in 2024
429 Medicare Part D claims for 196 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Ipratropium Bromide104 claims
- Azelastine Hcl57 claims
- Dexamethasone Sodium Phosphate36 claims
- Fluticasone Propionate24 claims
- Methylprednisolone21 claims
- Ciprofloxacin-Dexamethasone20 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.
The MIPS final score for 2023 (Medicare payment program): 98.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- MainehealthPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory L. Penner among 248 specialist records in Maine
Gregory L. Penner, M.D. is one of 248 specialist records with a practice address in Maine. 16% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 60% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileYes · 13% of these records are
- Graduated1983 · median 1992 among the 32 with a school on file
- Record last updated2015 · 87% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Maine
There are 248 specialist records in Maine.
All 248 in Maine → Every provider in Brunswick → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Jane CampbellBrunswick, ME 040111548575020
- Cari Clark, MS, OTR/LBrunswick, ME 040111902292816
- Heather KineeBrunswick, ME 040111912603713
- Kim Morin, OT/LBrunswick, ME 040111780066928
- Zoe Ryan-HumphreyBrunswick, ME 040111598462293
- Kimberly Leighton, CCLSBridgton, ME 040091780158477
- Joanne RidlonCasco, ME 040151447567557
- Mark Hirschhorn, MDBiddeford, ME 040051629026240
Common questions
What is Gregory L. Penner, M.D.'s NPI number?
Gregory L. Penner, M.D.'s National Provider Identifier (NPI) is 1275610198, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory L. Penner, M.D. located?
The NPPES record lists a practice address at 331 Maine St Ste 4, Brunswick, ME, 04011. Phone: (207) 721-0911. Providers update this record themselves, so call before visiting.
How can I verify Gregory L. Penner, M.D.'s license?
NPPES lists Maine license number 12949, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory L. Penner, M.D. prescribe under Medicare Part D?
In 2024, Gregory L. Penner, M.D. had 429 Medicare Part D claims for 196 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Gregory L. Penner, M.D.'s MIPS final score?
The 2023 MIPS final score is 98.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.