MARK ZAHNISER MD
NPI 1396738548
Anesthesiology - Critical Care Medicine in Cleveland, OH
About Mark Zahniser Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK ZAHNISER MD (NPI 1396738548) is an individual critical care medicine provider in Cleveland, Ohio, licensed in Ohio (35066970) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Providence Portland Medical Center, and is a graduate of Other (1990).
NPPES Registry Identity
Specialties & Licenses 6
Other Identifiers 15
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 Zahniser 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 Reassignment
Medicare enrollment records show Mark Zahniser reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Portland, OR 97213
- Reassigned Medicare billing, Oregon enrollment
- 419 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 3
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Providence Portland Medical Center
Acute Care Hospitals · Portland, OROther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CLEVELAND, OH 44106
CLEVELAND, OH 44106
CLEVELAND, OH 44106
CLEVELAND, OH 44106
CLEVELAND, OH 44106
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 Zahniser's NPI number?
The NPI number for Mark Zahniser is 1396738548. It was assigned to this individual provider in the NPPES registry on August 23, 2005.
Where is Mark Zahniser located?
Mark Zahniser practices at 11100 Euclid Ave, Cleveland, OH 44106. The listed phone number is (216) 844-7330.
What is Mark Zahniser's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Critical Care Medicine, with taxonomy code 207LC0200X.
Is Mark Zahniser enrolled in Medicare?
Yes. Mark Zahniser 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 organization bills Medicare for Mark Zahniser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Zahniser reassigns Medicare benefits to Hospitalist Medicine Physicians Of Washington - Tcs (Portland, OR). The 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 Zahniser's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Zahniser accept?
Health plans from CareSource list Mark Zahniser 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.
Is Mark Zahniser affiliated with any hospitals?
According to CMS data, Mark Zahniser is affiliated with Providence Portland Medical Center.
When was this NPI record last updated?
The NPPES record for Mark Zahniser was last updated on August 19, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Mark Zahniser, MD · NPI 1396738548
Critical Care Medicine physician in Cleveland, Ohio. Individual provider, active in the CMS NPPES registry since August 23, 2005.
## Identity
- **NPI:** 1396738548 (Entity type: Individual)
- **Enumerated:** August 23, 2005
- **Primary specialty:** Anesthesiology - Critical Care Medicine · taxonomy 207LC0200X
- **State license:** 35066970 (Ohio)
- **Sole proprietor:** No
## Practice location
- **Address:** 11100 EUCLID AVE, Cleveland, OH 44106
- **Phone:** (216) 844-7330 · **Fax:** (216) 844-3781
## 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:** Hospitalist Medicine Physicians Of Washington - Tcs (NPI 1649816380, Portland, OR), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1990
## Record status
- **NPPES last updated:** August 19, 2010
- **Other identifiers:** Other 000000231404 (OH); Other 050085791 (OH); Medicare PIN ZA4021564 (OH); and 12 more
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Source: [NPI Profile](https://npiprofile.com/npi/1396738548) · Data from the CMS NPPES public registry.