DR. ZACHARY CHARLES DRENNEN DO
NPI 1427518448
Anesthesiology in Pittsburgh, PA
About Dr. Zachary Charles Drennen Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ZACHARY CHARLES DRENNEN DO (NPI 1427518448) is an individual anesthesiology provider in Pittsburgh, Pennsylvania, licensed in Pennsylvania (OS023120) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Allegheny General Hospital, and maintains a secondary practice location in Largo.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Group Practice 1
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. Zachary Charles Drennen Do 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 Zachary Drennen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Pittsburgh, PA 15212
- Reassigned Medicare billing, Pennsylvania enrollment
- 2,881 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 2
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.
Allegheny General Hospital
Acute Care Hospitals · Pittsburgh, PAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PITTSBURGH, PA 15212
PITTSBURGH, PA 15212
PITTSBURGH, PA 15212
PITTSBURGH, PA 15212
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 Zachary Drennen's NPI number?
The NPI number for Zachary Drennen is 1427518448. It was assigned to this individual provider in the NPPES registry on March 25, 2019.
Where is Zachary Drennen located?
Zachary Drennen practices at 320 E North Ave, Pittsburgh, PA 15212. The listed phone number is (412) 359-3155.
What is Zachary Drennen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Zachary Drennen enrolled in Medicare?
Yes. Zachary Drennen 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 Zachary Drennen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Drennen reassigns Medicare benefits to Allegheny Clinic (Pittsburgh, PA). 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 Zachary Drennen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Zachary Drennen affiliated with any hospitals?
According to CMS data, Zachary Drennen is affiliated with Allegheny General Hospital.
When was this NPI record last updated?
The NPPES record for Zachary Drennen was last updated on December 1, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Zachary Charles Drennen, DO · NPI 1427518448
Anesthesiology physician in Pittsburgh, Pennsylvania. Individual provider, active in the CMS NPPES registry since March 25, 2019.
## Identity
- **NPI:** 1427518448 (Entity type: Individual)
- **Enumerated:** March 25, 2019
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** OS023120 (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 320 E NORTH AVE, Pittsburgh, PA 15212-4756
- **Phone:** (412) 359-3155 · **Fax:** (412) 359-3483
## 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:** Allegheny Clinic (NPI 1023018447, Pittsburgh, PA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Edward Via Col Of Osteo Medicine-Carolinas Campus, class of 2019
## Record status
- **NPPES last updated:** December 1, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1427518448) · Data from the CMS NPPES public registry.