IndividualActiveAccepts Medicare

Warren Ferris, MD

NPI 1487744280 · Internal Medicine Physician · Silver Spring, MD

Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Provider details

NPI number: 1487744280
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: D31918 (MD)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense D31918 (MD)
Allopathic & Osteopathic Physicians
Rheumatology Physician207RR0500XLicense D31918 (MD)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(73/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
19 yrs in NPPES registry
Profile completeness28% of score
100% of core fields populated
Practice footprint17% of score
1 documented practice location
Medicare service volume (vs. specialty peers)28% of score
746 Medicare services, 2024 (ranked within specialty)

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 methodology.

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)
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	595	$108
New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205	89	$205
Aspiration And/Or Injection of Fluid From Large Joint20610	31	$73
Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215	31	$142

Typical Medicare-allowed amounts for these services range $73–$205 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Prednisone	85	25
Methotrexate Sodiumbrand: Methotrexate	69	18
Celecoxib	52	11
Diclofenac Sodium	49	16
Alendronate Sodium	48	15
Hydroxychloroquine Sulfate	43	13
Allopurinol	35	—

Practice location

3305 North Leisure World Boulevard

Silver Spring, MD 20906

Phone: (301) 598-1554

Fax: (301) 558-1509

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Mailing address