Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joanna Lyn Roberts, PA, PTA

Physician Assistant in Oakland, CA · enumerated 2007 · practices at Carbon Health Medical Group of California PC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1164559506

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Registry record

Entity type Individual (Type 1)

Name Joanna Lyn Roberts

Credential PA, PTA

Sex Female

Practice address 411 Grand Ave, Oakland, CA, 94610

Phone (510) 844-4097

Enumeration date Feb 27, 2007

Last updated in NPPES Apr 17, 2018

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 52879 (CA) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

Other identifiers

Identifier	Type	State	Issuer
904080	Medicaid	AZ	-

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 → Validate an NPI →

Frequently asked questions

What specialty is Joanna Roberts?

Joanna Roberts is registered in NPPES with the primary taxonomy of Physician Assistant. 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

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Muriel Mayes Physical Therapist · Oakland, CA NPI 1184806564 Tobey Allen Marriage & Family Therapist · Oakland, CA NPI 1427302116 Carbon Health Medical Group of California PC Multi-Specialty Clinic/Center · Oakland, CA NPI 1972045144 Joshua Baxter Nurse Practitioner · Oakland, CA NPI 1932644036 Theresa Meinert Family Nurse Practitioner · Oakland, CA NPI 1215431895 Esther Nickelson Nurse Practitioner · Oakland, CA NPI 1164068268

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-04-17.