Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Evan L Siegel, M.D.
Rheumatology Physician in Rockville, MD · enumerated 2005 · practices at Arthritis & Rheumatism Associates, P.C..
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1578562617
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 30647 | Other | - | MAMSI |
| 52136603 | Other | MD | CAREFIRST OF MARYLAND |
| 30647 | Other | - | ALLIANCE |
| 0004330685 | Other | - | AETNA |
| 0008 | Other | DC | CAREFIRST OF DC |
| 53084100 | Medicaid | MD | - |
| 30421 | Other | - | PRIORITY PARTNERS |
| 777472 | Other | - | UNITED HEALTHCARE |
| 493061 | Other | - | NCPPO |
| 89402 | Other | - | FIRST HEALTH |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-17.