Frederick Karl Gregorius, MD
Frederick Karl Gregorius is a Specialist provider (Specialist) practicing in Stockton, CA, registered in the NPPES registry with NPI 1013936608 since 2006. The credential MD stands for Doctor of Medicine. Practices at F Karl Gregorius M.D., Inc. (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1013936608 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Frederick Karl Gregorius |
| Credential | MD |
| Sex | Male |
| Practice address | Stockton, CA, 95204 |
| Phone | 2099430305 |
| Fax | 2099430210 |
| Enumeration date | 2006-07-18 |
| Last updated in NPPES | 2010-06-18 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 174400000X | Specialist | Primary | G15246 | CA |
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 |
|---|---|---|---|
| 94-2650763 | Other | CA | TAX ID |
Copy-ready billing details
Provider: Frederick Gregorius, MD NPI: 1013936608 Taxonomy: 174400000X (Specialist) Address: Stockton, CA, 95204
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1487689030 | Moris Senegor | Individual | Specialist | Stockton, CA |
| 1720399389 | F Karl Gregorius M.D., Inc. | Organization | Neurological Surgery Physician | Stockton, CA |
Verify this record
Cross-check NPI 1013936608 against the authoritative CMS record: view Frederick Karl Gregorius on the official NPPES registry .
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. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2010-06-18.