Thalia Mayes, M.D.
Gastroenterology Physician · Portland, ME
Thalia Mayes, M.D. is a gastroenterology physician with a practice address in Portland, Maine, and NPI 1033126826, issued on Aug 2, 2006. Check the license (Maine 017618, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Thalia Mayes
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 017618 ME
Self-reported in NPPES; status is on the state search - Practice location
- 161 Marginal Way, Portland, ME 04101
- Phone
- (207) 773-7964
- Enumerated
- Aug 2, 2006
- Record last updated
- Sep 8, 2022
- Fax
- (207) 773-9073
- Medicaid ID
- 432967599 ME
- Medicare enrollment
- Enrolled (PECOS I20081031000055); accepts Medicare assignment
- Medical or professional school
- University Of Rochester School Of Medicine And Dentistry, 2002
- 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 Thalia Mayes in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license 017618Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average gastroenterology physician in 2024
459 Medicare Part D claims for 190 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Omeprazole106 claims
- Gavilyte-G73 claims
- Famotidine31 claims
- Pantoprazole Sodium28 claims
- Ursodiol27 claims
- Stelara23 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: $86.00
1 payment: food and beverage; the largest payer was Lilly USA, LLC. 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).
Thalia Mayes among 86 gastroenterology physician records in Maine
Thalia Mayes, 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 2006, is newer than 15% of them.
- NPI issued2006 · 15% of these records are older, 44% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2002 · 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
- Gordon Millspaugh, M.D.Portland, ME 041011114025988
Common questions
What is Thalia Mayes, M.D.'s NPI number?
Thalia Mayes, M.D.'s National Provider Identifier (NPI) is 1033126826, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thalia Mayes, 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 Thalia Mayes, M.D.'s license?
NPPES lists Maine license number 017618, 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 Thalia Mayes, M.D. prescribe under Medicare Part D?
In 2024, Thalia Mayes, M.D. had 459 Medicare Part D claims for 190 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Thalia Mayes, 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.