Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Howard S An, MD
Orthopaedic Surgery of the Spine Physician in Chicago, IL · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1255310157
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 207073 | Other | IL | MEDICARE PTAN LOCALITY 15 |
| DA4902 | Other | - | RAILROAD MEDICARE PTAN |
| 4571847 | Other | - | AETNA |
| P00095449 | Other | - | RAILROAD MEDICARE |
| 1633878 | Other | IL | BCBS |
| 207067 | Other | IL | MEDICARE PTAN LOCALITY 16 |
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 2018-09-19.