Grant Louie, M.D.
NPI 1306013214 · Rheumatology Physician · Frederick, MD
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Louie, M.D. is a Rheumatology Physician provider in Frederick, MD (NPI 1306013214).
Provider details
- NPI number
- 1306013214
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D71182 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
8,195 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 | 996 | $16 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 796 | $10 |
| Measurement C-Reactive Protein for Detection of Infection Or Inflammation86140 | 745 | $5 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 724 | $128 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 703 | $127 |
| 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 |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 338 | 80 |
| Prednisone | 235 | 60 |
| Hydroxychloroquine Sulfate | 219 | 62 |
| Alendronate Sodium | 77 | 24 |
| Tramadol Hcl | 74 | 20 |
| Gabapentin | 58 | — |
| Allopurinol | 54 | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$132 across 2 records (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
Registry dates
- Enumerated
- 2008-05-09
- Last updated
- 2026-02-05
- Certified
- 2026-02-05
Frequently asked questions
- What is Grant Louie's NPI number?
- Grant Louie's National Provider Identifier (NPI) is 1306013214, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Louie's specialty?
- Grant Louie is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Louie located?
- Grant Louie's practice location on file with NPPES is 161 Thomas Johnson Dr Ste 250, Frederick, MD 21702-4958.
- What is Grant Louie's phone number?
- The practice phone number listed in the NPPES registry for Grant Louie is (301) 942-7600.
- Does Grant Louie accept Medicare?
- Grant Louie is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Louie's NPI active?
- Yes — Grant Louie's NPI (1306013214) 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.