Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Lee Ditmars, MD

Surgery Physician in Antioch, CA · enumerated 2006.

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

National Provider Identifier

1265440101

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Registry record

Entity type Individual (Type 1)

Name Michael Lee Ditmars

Credential MD

Sex Male

Practice address 3903 Lone Tree Way, Suite 210, Antioch, CA, 94509

Phone (925) 757-0800

Fax (925) 757-2160

Enumeration date Aug 4, 2006

Last updated in NPPES Dec 1, 2021

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License G080207 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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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Frequently asked questions

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.

What specialty is Michael Ditmars?

Michael Ditmars is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Dennis Zai Gastroenterology Physician · Antioch, CA NPI 1740253350 Delta Pediatrics Medical Group, Inc. Preferred Provider Organization · Antioch, CA NPI 1750334660 Hamidreza Khonsari Family Medicine Physician · Antioch, CA NPI 1306874714 Full Care Medical Group, Inc. Family Medicine Physician · Antioch, CA NPI 1215960091 Sumner Seibert Orthopaedic Surgery Physician · Antioch, CA NPI 1255350534 Naoko Ikeda Family Medicine Physician · Antioch, CA NPI 1952403909 Dennis Zai, M.D., Inc Gastroenterology Physician · Antioch, CA NPI 1578659561 Alex A. Aslan, MD, Inc Gastroenterology Physician · Antioch, CA NPI 1750477733

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-01.