Katherine Keller, DO
Specialist · Portland, ME
Katherine Keller, DO is a specialist with a practice address in Portland, Maine, and NPI 1568854404, issued on Mar 2, 2015. Check the license (Maine DO3067, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katherine Keller
- Credential
- DO
- Primary taxonomy
- Specialist 174400000X
- License numbers
- DO3067 ME
TP17026 ME
04324 KY
Self-reported in NPPES; status is on the state search - Practice location
- 51 Sewall St Ste 1, Portland, ME 04102
- Phone
- (207) 774-5761
- Enumerated
- Mar 2, 2015
- Record last updated
- Jan 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (207) 874-7478
- Medicare enrollment
- Enrolled (PECOS I20201116001513); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest specialist records → All 248 in Maine → Look up another NPI →
Also registered at 51 Sewall St Ste 1
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelly Daly, APRN, FNP-CFamily Nurse Practitioner1013019348
- Thomas Hopkins, NPFamily Nurse Practitioner1730737065
- Jessica Radway, PA-CSpecialist1194020891
Verify Katherine Keller in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license DO3067Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% fewer Medicare Part D claims than the average specialist in 2024
697 Medicare Part D claims for 189 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 45 claims were for opioids.
Most prescribed
- Prednisone159 claims
- Methotrexate100 claims
- Hydroxychloroquine Sulfate93 claims
- Alendronate Sodium32 claims
- Hydrocodone-Acetaminophen26 claims
- Xeljanz24 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 practice group's MIPS final score for 2023 (Medicare payment program): 95.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Rheumatology Associates P.A.Portland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Keller among 248 specialist records in Maine
Katherine Keller, DO 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 2015, is newer than 92% of them.
- NPI issued2015 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 16% of these records are
- In the CMS Doctors and Clinicians fileYes · 13% of these records are
- Graduated2015 · median 1992 among the 32 with a school on file
- Record last updated2021 · 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 Portland → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Valerie Blais, MTPortland, ME 041021093768129
- Barbara Chilmonczyk, M.D.Portland, ME 041021497793210
- Brian Daikh, MDPortland, ME 041021184617953
- Douglas Dellefemine, LMTPortland, ME 041021982847000
- David Ernst, M.D.Portland, ME 041021386635308
- Edward Fels, MDPortland, ME 041021508086083
- Brian Keroack, MDPortland, ME 041021891788659
- Michael Marchetta, MTPortland, ME 041021700813847
Common questions
What is Katherine Keller, DO's NPI number?
Katherine Keller, DO's National Provider Identifier (NPI) is 1568854404, issued on Mar 2, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Keller, DO located?
The NPPES record lists a practice address at 51 Sewall St Ste 1, Portland, ME, 04102. Phone: (207) 774-5761. Providers update this record themselves, so call before visiting.
How can I verify Katherine Keller, DO's license?
NPPES lists Maine license number DO3067, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Katherine Keller, DO prescribe under Medicare Part D?
In 2024, Katherine Keller, DO had 697 Medicare Part D claims for 189 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Katherine Keller, DO's MIPS final score?
The 2023 MIPS final score is 95.4 of 100, reported for the practice group. 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.