Katherine Ann Maher, M.D.
Rheumatology Physician · Frederick, MD
Katherine Ann Maher, M.D. is a rheumatology physician with a practice address in Frederick, Maryland, and NPI 1225353865, issued on Apr 6, 2010. Check the license (Maryland D0088133, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Katherine Ann Maher
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- D0088133 MD
Self-reported in NPPES; status is on the state search - Practice location
- 161 Thomas Johnson Dr Ste 250, Frederick, MD 21702
- Phone
- (301) 942-7600
- Enumerated
- Apr 6, 2010
- Record last updated
- Feb 17, 2026
- Fax
- (301) 694-0187
- Medicare enrollment
- Enrolled (PECOS I20191010001477); accepts Medicare assignment
- Medical or professional school
- Georgetown University School Of Medicine, 2010
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 214 in Maryland → Look up another NPI →
Also registered at 161 Thomas Johnson Dr Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alyssa Bosso, MDRheumatology Physician1689202350
- Grant Louie, M.D.Rheumatology Physician1306013214
- Louisa Ziglar, MDRheumatology Physician1538336151
Verify Katherine Ann Maher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0088133Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average rheumatology physician in 2024
971 Medicare Part D claims for 219 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Prednisone177 claims
- Methotrexate94 claims
- Hydroxychloroquine Sulfate79 claims
- Alendronate Sodium66 claims
- Allopurinol39 claims
- Celecoxib36 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): 77.1 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).
Industry payments in 2024: $137.40
1 payment: food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 4,486 providers of this specialty with any payment received $8,538.33 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 2 group practices
- Amber Hill Physical Therapy IncFrederick, MD
- Arthritis And Rheumatism Associates PCFrederick, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Ann Maher among 214 rheumatology physician records in Maryland
Katherine Ann Maher, M.D. is one of 214 rheumatology physician records with a practice address in Maryland. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 71% of them.
- NPI issued2010 · 71% of these records are older, 25% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2010 · median 2001 among the 132 with a school on file
- Record last updated2026 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Maryland
There are 214 rheumatology physician records in Maryland.
All 214 in Maryland → Every provider in Frederick → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Neeti Bhargava, M.D.Frederick, MD 217021588634018
- Alyssa Bosso, MDFrederick, MD 217021689202350
- Grant Louie, M.D.Frederick, MD 217021306013214
- Louisa Ziglar, MDFrederick, MD 217021538336151
- Steven Klein, MDHagerstown, MD 217401730185471
- Okechukwu OkoyeHagerstown, MD 217401174083711
- Francesca Okoye, MD-PHDHagerstown, MD 217421992002992
- Mary Romanic, M.D.Hagerstown, MD 217421467554097
Common questions
What is Katherine Ann Maher, M.D.'s NPI number?
Katherine Ann Maher, M.D.'s National Provider Identifier (NPI) is 1225353865, issued on Apr 6, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Ann Maher, M.D. located?
The NPPES record lists a practice address at 161 Thomas Johnson Dr Ste 250, Frederick, MD, 21702. Phone: (301) 942-7600. Providers update this record themselves, so call before visiting.
How can I verify Katherine Ann Maher, M.D.'s license?
NPPES lists Maryland license number D0088133, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Ann Maher, M.D. prescribe under Medicare Part D?
In 2024, Katherine Ann Maher, M.D. had 971 Medicare Part D claims for 219 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Katherine Ann Maher, M.D.'s MIPS final score?
The 2023 MIPS final score is 77.1 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.