Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Mary Ann Gardiner, C.R.N.P
Family Nurse Practitioner in Arnold, MD · enumerated 2005 · practices at Maryland Primary Care Physicians, LLC.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1164423455
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 9122236 | Other | MD | AETNA PPO |
| 687423-02 | Other | MD | CAREFIRST MD RENDERING |
| 120106 | Other | MD | JHHC PROVIDER NUMBER |
| 7605-0053 | Other | MD | CAREFIRST BLUECHOICE |
| 400109500 | Medicaid | MD | - |
| 500026827 | Other | MD | RAILROAD MEDICARE |
| 1978522 | Other | MD | AETNA HMO |
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 2019-08-22.