Doctor profile · Federal record
Dr. Thalia Mayes, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Portland, ME
- NPI 1033126826
- Accepts Medicare
- MIPS 93.1 / 100 · 2023
- 24 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
161 Marginal Way
Portland, ME 041012438
(207) 773-7964
fax (207) 773-9073
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- September 8, 2022
- Year of graduation
- 2002 — 24 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Maine #017618
- Medicaid
- ME #432967599
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1033126826. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
607
Distinct HCPCS
7
Medicare allowed
$54,472
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 264 | 82 | $72 | |
G0500 |
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | 76 | 75 | $5 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 74 | 73 | $242 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 60 | 60 | $66 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 50 | 43 | $85 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 44 | 43 | $94 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 39 | 29 | $123 |
In context: peer comparison
Among 14 peers in Portland Gastroenterology Physician, average services per provider: 56. This provider delivers 11× the peer median.Open Payments
Industry payments received
All-time total
$86
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Lilly USA, LLC | 1 | $86.00 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
242
Patients
88
Total drug cost
$531,382
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 88 | 39 | $1,117 |
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 55 | 49 | $907 |
| Ursodiol | Generic | 30 | 0 | $8,198 |
| Pantoprazole Sodium | Generic | 22 | 0 | $539 |
| Stelara (Ustekinumab) | Brand | 20 | 0 | $515,015 |
| Famotidine | Generic | 15 | 0 | $266 |
| Mesalamine ER (Mesalamine) | Brand | 12 | 0 | $5,340 |
Hospital affiliations
Frequently asked questions
What is Dr. Thalia Mayes's medical specialty?
Dr. Thalia Mayes practices Gastroenterology Physician in Portland, ME.
Where does Dr. Thalia Mayes practice?
Dr. Thalia Mayes practices at 161 Marginal Way, Portland, ME 041012438. Office phone: 2077737964.
What is Dr. Thalia Mayes's NPI?
Dr. Thalia Mayes's National Provider Identifier (NPI) is 1033126826, issued by NPPES.
Does Dr. Thalia Mayes accept Medicare assignment?
Yes. Dr. Thalia Mayes accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Thalia Mayes commonly perform?
Top Medicare-reported procedures in 2023: Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (HCPCS G0500); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385). Source: CMS Medicare Physician & Other Practitioners file.