MARK P. CLARK MD
NPI 1891874665
Internal Medicine in Glendale, CA
About Mark P. Clark Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK P. CLARK MD (NPI 1891874665) is an individual internal medicine provider in Glendale, California, licensed in California (G50527) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Francisco, and is a graduate of Loyola University Of Chicago, Stritch School Of Medicine (1982).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mark P. Clark Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Mark Clark reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Glendale, CA 91214
- Reassigned Medicare billing, California enrollment
- 34 clinicians in this Medicare group
Los Angeles, CA 90025
- Reassigned Medicare billing, California enrollment
- 51 clinicians in this Medicare group
San Diego, CA 92101
- Reassigned Medicare billing, California enrollment
- 291 clinicians in this Medicare group
San Francisco, CA 94124
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
Sacramento, CA 95816
- Reassigned Medicare billing, California enrollment
- 37 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91214 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Clark's NPI number?
The NPI number for Mark Clark is 1891874665. It was assigned to this individual provider in the NPPES registry on November 3, 2006.
Where is Mark Clark located?
Mark Clark practices at 3746 Foothill Blvd # B140, Glendale, CA 91214. The listed phone number is (310) 445-5999.
What is Mark Clark's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Clark enrolled in Medicare?
Yes. Mark Clark is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Clark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Clark reassigns Medicare benefits to 5 organizations: Skilled Physicians Group (Glendale, CA), Skilled Facility Health Care Solutions Inc (Los Angeles, CA), One Medical Group, Inc (San Diego, CA), City & County Of San Francisco (San Francisco, CA) and Skilled Biologics, Inc. (Sacramento, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Clark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Clark accept?
Health plans from UnitedHealthcare list Mark Clark as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Mark Clark was last updated on November 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mark P. Clark, MD · NPI 1891874665
Internal Medicine physician in Glendale, California. Individual provider, active in the CMS NPPES registry since November 3, 2006.
## Identity
- **NPI:** 1891874665 (Entity type: Individual)
- **Enumerated:** November 3, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** G50527 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3746 FOOTHILL BLVD # B140, Glendale, CA 91214-1740
- **Phone:** (310) 445-5999 · **Fax:** (323) 544-4248
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Skilled Physicians Group (NPI 1902444623, Glendale, CA); Skilled Facility Health Care Solutions Inc (NPI 1073763462, Los Angeles, CA); One Medical Group, Inc (NPI 1801666904, San Diego, CA); City & County Of San Francisco (NPI 1184351082, San Francisco, CA); Skilled Biologics, Inc. (NPI 1376386763, Sacramento, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loyola University Of Chicago, Stritch School Of Medicine, class of 1982
## Record status
- **NPPES last updated:** November 18, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1891874665) · Data from the CMS NPPES public registry.