Grace Ahn, M.D.
NPI 1982884896 · Rheumatology Physician · Rockville, MD
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grace Ahn, M.D. is a Rheumatology Physician provider in Rockville, MD (NPI 1982884896).
Provider details
- NPI number
- 1982884896
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- D76362 (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
18 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
8,146 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 | 1,156 | $18 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 907 | $141 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 756 | $9 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation86140 | 580 | $5 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 575 | $10 |
| Red Blood Cell Sedimentation Rate, to Detect Inflammation, Automated |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 194 | 63 |
| Methotrexate Sodiumbrand: Methotrexate | 191 | 58 |
| Prednisone | 147 | 44 |
| Alendronate Sodium | 127 | 37 |
| Allopurinol | 109 | 29 |
| Leflunomide | 108 | 34 |
| Meloxicam | 88 | 28 |
| Celecoxib |
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)
- 8270 Willow Oaks Corporate Dr Ste 150Fairfax, VA 22031-4530Phone: (703) 573-2220
Registry dates
- Enumerated
- 2007-11-08
- Last updated
- 2026-02-05
- Certified
- 2026-02-05
Frequently asked questions
- What is Grace Ahn's NPI number?
- Grace Ahn's National Provider Identifier (NPI) is 1982884896, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grace Ahn's specialty?
- Grace Ahn is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Grace Ahn located?
- Grace Ahn's practice location on file with NPPES is 14995 Shady Grove Rd Ste 500, Rockville, MD 20850-8726.
- What is Grace Ahn's phone number?
- The practice phone number listed in the NPPES registry for Grace Ahn is (301) 942-7600.
- Does Grace Ahn accept Medicare?
- Grace Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grace Ahn's NPI active?
- Yes — Grace Ahn's NPI (1982884896) is active in the NPPES registry as of the last update on 2026-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.