DR. MARK R. HOLLEMON D.O.
NPI 1881709210
Internal Medicine in Portland, OR
About Dr. Mark R. Hollemon D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK R. HOLLEMON D.O. (NPI 1881709210) is an individual internal medicine provider in Portland, Oregon, licensed in Oregon (DO18822) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of University Of North Texas Hsc, College Of Osteopathic Med (1993).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Mark R. Hollemon D.o. 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
3Medicare enrollment records show Mark Hollemon reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 clinicians in this Medicare group
Alhambra, CA 91801
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Apollomed Hospitalists A Medical Corporation
- 25 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 97210 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTLAND, OR 97210
PORTLAND, OR 97210
PORTLAND, OR 97210
PORTLAND, OR 97210
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 Hollemon's NPI number?
The NPI number for Mark Hollemon is 1881709210. It was assigned to this individual provider in the NPPES registry on August 19, 2006.
Where is Mark Hollemon located?
Mark Hollemon practices at 2330 NW Flanders St Suite 104, Portland, OR 97210. The listed phone number is (503) 224-0817.
What is Mark Hollemon's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Hollemon enrolled in Medicare?
Yes. Mark Hollemon 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 Hollemon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Hollemon reassigns Medicare benefits to 3 organizations: Permanente Medical Group Inc (Vallejo, CA), Hospitalist Medicine Physicians Of California, Inc (Apple Valley, CA) and Astrana Care Hospitalists, A Medical Corporation (Alhambra, 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 Hollemon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Hollemon was last updated on February 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.
# Dr. Mark R. Hollemon, D.O. · NPI 1881709210
Internal Medicine physician in Portland, Oregon. Individual provider, active in the CMS NPPES registry since August 19, 2006.
## Identity
- **NPI:** 1881709210 (Entity type: Individual)
- **Enumerated:** August 19, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** DO18822 (Oregon)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2330 NW FLANDERS ST, SUITE 104, Portland, OR 97210-3442
- **Phone:** (503) 224-0817 · **Fax:** (503) 224-0839
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Permanente Medical Group Inc (NPI 1336222397, Vallejo, CA); Hospitalist Medicine Physicians Of California, Inc (NPI 1184663965, Apple Valley, CA); Astrana Care Hospitalists, A Medical Corporation (NPI 1265658595, Alhambra, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of North Texas Hsc, College Of Osteopathic Med, class of 1993
## Record status
- **NPPES last updated:** February 11, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1881709210) · Data from the CMS NPPES public registry.