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Mark Altchek, M.D.
NPI 1154503670 · Internal Medicine Physician · Merced, CA
Mark Altchek, M.D. is a Internal Medicine Physician provider in Merced, CA (NPI 1154503670).
Provider details
- NPI number
- 1154503670
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G43919 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(88/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
1343 W Main St
Merced, CA 95340-4438
Phone: (209) 725-1060
Fax: (209) 725-1064
Street-level locationGet directions
Mailing address
7246 Remmet Ave
Canoga Park, CA 91303-1531
Registry dates
- Enumerated
- 2007-11-27
- Last updated
- 2007-11-27
Frequently asked questions
- What is Mark Altchek's NPI number?
- Mark Altchek's National Provider Identifier (NPI) is 1154503670, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Altchek's specialty?
- Mark Altchek is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Altchek located?
- Mark Altchek's practice location on file with NPPES is 1343 W Main St, Merced, CA 95340-4438.
- What is Mark Altchek's phone number?
- The practice phone number listed in the NPPES registry for Mark Altchek is (209) 725-1060.
- Is Mark Altchek's NPI active?
- Yes — Mark Altchek's NPI (1154503670) is active in the NPPES registry as of the last update on 2007-11-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.