Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark Duane Welch, D.C.
Chiropractor in Modesto, CA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1942292818
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Registry record
Entity type Individual (Type 1)
Name Dr. Mark Duane Welch
Credential D.C.
Sex Male
Practice address 1101 Standiford Ave, Ste A6, Modesto, CA, 95350
Phone (209) 522-0822
Fax (209) 522-4563
Enumeration date Aug 17, 2005
Last updated in NPPES Feb 28, 2023
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| ZZZ61519Z | Other | CA | BLUE SHIELD |
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 Mark Welch?
Mark Welch is registered in NPPES with the primary taxonomy of Chiropractor. 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 → Marla Welch Chiropractor · Modesto, CA NPI 1760474415 Leroy Egenberger Mental Health Counselor · Modesto, CA NPI 1922082726 Marianne Peck Mental Health Counselor · Modesto, CA NPI 1487674636 Blake Alexander Dermatology Physician · Modesto, CA NPI 1033132170 Daniel Smith Marriage & Family Therapist · Modesto, CA NPI 1134214463 Rahim Mesbah Dentist · Modesto, CA NPI 1124194469 Welch Chiropractic Office Chiropractor · Modesto, CA NPI 1659419463 Fred P. Guarcello, Od Optometrist · Modesto, CA NPI 1902935893
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-28.