Katherine Maher, M.D.
NPI 1225353865 · Rheumatology Physician · Frederick, MD
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Maher, M.D. is a Rheumatology Physician provider in Frederick, MD (NPI 1225353865).
Provider details
- NPI number
- 1225353865
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- D0088133 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
6,064 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 1,193 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 689 | $132 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 418 | $9 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 411 | $10 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 392 | $96 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 177 | 59 |
| Methotrexate Sodiumbrand: Methotrexate | 94 | 32 |
| Hydroxychloroquine Sulfate | 79 | 29 |
| Alendronate Sodium | 66 | 23 |
| Allopurinol | 39 | 13 |
| Celecoxib | 36 | 15 |
| Duloxetine Hcl | 31 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$137 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 14995 Shady Grove Rd Ste 250Rockville, MD 20850-8727Phone: (301) 942-7600Fax: (301) 217-9241
Registry dates
- Enumerated
- 2010-04-06
- Last updated
- 2026-02-17
- Certified
- 2026-02-17
Frequently asked questions
- What is Katherine Maher's NPI number?
- Katherine Maher's National Provider Identifier (NPI) is 1225353865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Maher's specialty?
- Katherine Maher is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Maher located?
- Katherine Maher's practice location on file with NPPES is 161 Thomas Johnson Dr Ste 250, Frederick, MD 21702-4958.
- What is Katherine Maher's phone number?
- The practice phone number listed in the NPPES registry for Katherine Maher is (301) 942-7600.
- Does Katherine Maher accept Medicare?
- Katherine Maher is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Maher's NPI active?
- Yes — Katherine Maher's NPI (1225353865) is active in the NPPES registry as of the last update on 2026-02-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.