Gregory A. Schimmack, PA-C
Surgical Physician Assistant · Portland, ME
Gregory A. Schimmack, PA-C is a surgical physician assistant with a practice address in Portland, Maine, and NPI 1538355755, issued on Sep 20, 2007. Check the license (Maine PA001123, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory A. Schimmack
- Credential
- PA-C
- Primary taxonomy
- Surgical Physician Assistant 363AS0400X
- License number
- PA001123 ME
Self-reported in NPPES; status is on the state search - Practice location
- 818 Congress St, Portland, ME 04102
- Phone
- (207) 773-8161
- Enumerated
- Sep 20, 2007
- Record last updated
- Aug 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (207) 773-1489
- Medicare enrollment
- Enrolled (PECOS I20091021000320); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest surgical physician assistant records → All 205 in Maine → Look up another NPI →
Also registered at 818 Congress St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lawrence Adrian, P.A.-CSurgical Physician Assistant1891707493
- Ziyad Binsalamah, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1164843207
- Melissa Blier, PA-CSurgical Physician Assistant1528137726
- Scott Buchanan, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1932154135
- Lindsey Chorney, AGACNPAcute Care Nurse Practitioner1386077873
- Justin Claire, PA-CSurgical Physician Assistant1043746944
Verify Gregory A. Schimmack in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license PA001123Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average surgical physician assistant in 2024
11 Medicare Part D claims, against an average of 304 among the 10,174 providers of this specialty who prescribed in Part D.
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 A. Schimmack among 205 surgical physician assistant records in Maine
Gregory A. Schimmack, PA-C is one of 205 surgical physician assistant records with a practice address in Maine. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 30% of them.
- NPI issued2007 · 30% of these records are older, 67% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2007 · median 2013 among the 170 with a school on file
- Record last updated2012 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AS0400X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
67 surgical physician assistant records list a practice address in Portland
They are 67 of the 6,022 NPPES records with a practice address in Portland, and 205 surgical physician assistant records in Maine.
All 205 in Maine → Every provider in Portland → Surgical Physician Assistant nationwide →
The 8 surgical physician assistant records with the nearest ZIP codes
- Lawrence Adrian, P.A.-CPortland, ME 041021891707493
- Scott Benevides, PA-CPortland, ME 041021548256035
- Peter Donovan, PA-CPortland, ME 041021366549438
- Denise Emple, PA-CPortland, ME 041021437145067
- Jeffery Fox, P.A.Portland, ME 041021396707873
- Matthew Guilbeault, PA-CPortland, ME 041021306956974
- Brian Halla, PA-CPortland, ME 041021528053931
- Nathan Haynes, PA-CPortland, ME 041021598755258
Common questions
What is Gregory A. Schimmack, PA-C's NPI number?
Gregory A. Schimmack, PA-C's National Provider Identifier (NPI) is 1538355755, issued on Sep 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory A. Schimmack, PA-C located?
The NPPES record lists a practice address at 818 Congress St, Portland, ME, 04102. Phone: (207) 773-8161. Providers update this record themselves, so call before visiting.
How can I verify Gregory A. Schimmack, PA-C's license?
NPPES lists Maine license number PA001123, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory A. Schimmack, PA-C prescribe under Medicare Part D?
In 2024, Gregory A. Schimmack, PA-C had 11 Medicare Part D claims; the average among surgical physician assistant prescribers was 304. Part D covers Medicare prescriptions only.
What is Gregory A. Schimmack, PA-C'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.