Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John Gilbert Oas, M.D.
Neurology Physician in Gahanna, OH · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336146638
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Registry record
Entity type Individual (Type 1)
Name Dr. John Gilbert Oas
Credential M.D.
Sex Male
Practice address 920 N Hamilton Rd Ste 500, Gahanna, OH, 43230
Phone (614) 293-4969
Fax (614) 293-6111
Enumeration date Jun 30, 2005
Last updated in NPPES Nov 10, 2020
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P01686413 | Other | OH | RAILROAD MEDICARE |
| 2104476 | Medicaid | OH | - |
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.
Frequently asked questions
What specialty is John Oas?
John Oas is registered in NPPES with the primary taxonomy of Neurology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all → Yasushi Kisanuki Neurology Physician · Gahanna, OH NPI 1518182419 Kevin Weber Neurology Physician · Gahanna, OH NPI 1770875759 Rochelle O'Neil Psychologist · Gahanna, OH NPI 1487180394 Kimberly Springer Nurse Practitioner · Gahanna, OH NPI 1376199612 Deborah Hartnett Family Nurse Practitioner · Gahanna, OH NPI 1144876129 Claire Speelman Clinical Neuropsychologist · Gahanna, OH NPI 1851076152 Claire Alexander Clinical Psychologist · Gahanna, OH NPI 1013477397
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-10.