Matthew Drew Grunwald, M.D.
Gastroenterology Physician · Portland, ME
Matthew Drew Grunwald, M.D. is a gastroenterology physician with a practice address in Portland, Maine, and NPI 1689061954, issued on Apr 23, 2015. Check the license (Maine MD25916, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Matthew Drew Grunwald
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD25916 ME
Self-reported in NPPES; status is on the state search - Practice location
- 161 Marginal Way, Portland, ME 04101
- Phone
- (207) 773-7964
- Enumerated
- Apr 23, 2015
- Record last updated
- Dec 19, 2022
- Fax
- (207) 773-9073
- Medicare enrollment
- Enrolled (PECOS I20220727000155); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 86 in Maine → Look up another NPI →
Also registered at 161 Marginal Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Noemi Baffy, MDGastroenterology Physician1164710075
- Richard Bazarian, MDRetina Specialist (Ophthalmology) Physician1891791455
- Fernando Calmet, M.D.Gastroenterology Physician1659690956
- Melanie Connors, FNPFamily Nurse Practitioner1497881833
- Vicki Cook, NP-CNurse Practitioner1548820384
- John Erkkinen, M.D.Gastroenterology Physician1154429918
Verify Matthew Drew Grunwald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD25916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average gastroenterology physician in 2024
290 Medicare Part D claims for 132 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Omeprazole61 claims
- Gavilyte-G39 claims
- Carvedilol24 claims
- Ursodiol15 claims
- Mesalamine12 claims
- Colestipol Hcl11 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).
Industry payments in 2024: $231.46
9 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Portland Gastroenterology Associates PAPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew Drew Grunwald among 86 gastroenterology physician records in Maine
Matthew Drew Grunwald, M.D. is one of 86 gastroenterology physician records with a practice address in Maine. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 84% of them.
- NPI issued2015 · 84% of these records are older, 13% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2015 · median 2003 among the 61 with a school on file
- Record last updated2022 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Maine
There are 86 gastroenterology physician records in Maine.
All 86 in Maine → Every provider in Portland → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Noemi Baffy, MDPortland, ME 041011164710075
- Fernando Calmet, M.D.Portland, ME 041011659690956
- John Erkkinen, M.D.Portland, ME 041011154429918
- Joshua Goldman, M.D.Portland, ME 041011558396523
- Douglas Howell, MDPortland, ME 041011902904758
- Kate Kennedy, MDPortland, ME 041011134325806
- Alan Kilby, MDPortland, ME 041011558456442
- Thalia Mayes, M.D.Portland, ME 041011033126826
Common questions
What is Matthew Drew Grunwald, M.D.'s NPI number?
Matthew Drew Grunwald, M.D.'s National Provider Identifier (NPI) is 1689061954, issued on Apr 23, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Drew Grunwald, M.D. located?
The NPPES record lists a practice address at 161 Marginal Way, Portland, ME, 04101. Phone: (207) 773-7964. Providers update this record themselves, so call before visiting.
How can I verify Matthew Drew Grunwald, M.D.'s license?
NPPES lists Maine license number MD25916, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Matthew Drew Grunwald, M.D. prescribe under Medicare Part D?
In 2024, Matthew Drew Grunwald, M.D. had 290 Medicare Part D claims for 132 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Matthew Drew Grunwald, 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.