Gregory WithersM.D.
Neurosurgery·Arcadia, CA
Gregory Withers, M.D. is a Neurosurgery provider in Arcadia, CA affiliated with 1 ambulatory surgery center in CA, as of July 2026.
- NPI1700804382
- Registered2006
- Centers1
- StateCA
- Class of1973
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
Gregory Withers at a glance
- Provider
- Gregory Withers
- Credential
- M.D.
- Specialty
- Neurosurgery
- Procedures
- Neurosurgery CPT codes
- Location
- Arcadia, CA
- Medical school
- University of California, Geffen School of Medicine
- Graduated
- 1973
- NPI registered
- 2006
- NPI
- 1700804382
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Gregory Withers practice?
Gregory Withers, M.D. is based in Arcadia, CA and is affiliated with 1 ambulatory surgery center: Smart Surgery Center LLC in Arcadia, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Gregory Withers's NPI number?
Gregory Withers's National Provider Identifier (NPI) is 1700804382, registered in 2006. Specialty on record: Neurosurgery; credential M.D.
Where did Gregory Withers go to medical school?
Gregory Withers, M.D. attended University of California, Geffen School of Medicine, graduating in 1973.
How many Neurosurgery providers in California work at ambulatory surgery centers?
127 Neurosurgery surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Gregory Withers among them. The California Neurosurgery directory lists each one by city with credential, NPI, and center affiliations.
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