CALVIN BRIAN MAH CRNA
NPI 1285870253
Nurse Anesthetist, Certified Registered in Harrisburg, PA
About Calvin Brian Mah Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CALVIN BRIAN MAH CRNA (NPI 1285870253) is an individual nurse anesthetist, certified registered in Harrisburg, Pennsylvania, licensed in Pennsylvania (RN570026) and active in the NPI registry since December 2008. He is affiliated with Upmc Pinnacle Hospitals, maintains 2 additional practice locations, and is a graduate of University Of Pittsburgh School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 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
Calvin Brian Mah Crna 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 Calvin Mah reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harrisburg, PA 17111
- Reassigned Medicare billing, Pennsylvania enrollment
- 994 clinicians in this Medicare group
Harrisburg, PA 17101
- Reassigned Medicare billing, Pennsylvania enrollment
- 394 clinicians in this Medicare group
Middletown, PA 17057
- Reassigned Medicare billing, Pennsylvania enrollment
- 2,216 clinicians in this Medicare group
Hershey, PA 17033
- Reassigned Medicare billing, Pennsylvania enrollment
- 27 clinicians in this Medicare group
Richfield, PA 17086
- Reassigned Medicare billing, Pennsylvania enrollment
- Medicare enrollment name: Geisinger Clinic
- 4,429 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Upmc Pinnacle Hospitals
Acute Care Hospitals · Harrisburg, PAMilton S Hershey Medical Center
Acute Care Hospitals · Hershey, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17109 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.
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 Calvin Mah's NPI number?
The NPI number for Calvin Mah is 1285870253. It was assigned to this individual provider in the NPPES registry on December 23, 2008.
Where is Calvin Mah located?
Calvin Mah practices at 4300 Londonderry Rd, Harrisburg, PA 17109. The listed phone number is (717) 782-5118.
What is Calvin Mah's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Calvin Mah enrolled in Medicare?
Yes. Calvin Mah 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 Calvin Mah's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Calvin Mah reassigns Medicare benefits to 5 organizations: Penn State Health Medical Group, LLC (Harrisburg, PA), Upmc Pinnacle Anesthesia Services, LLC (Harrisburg, PA), The Milton S. Hershey Medical Center Physicians Group (Middletown, PA), Hershey Anesthesia LLC (Hershey, PA) and Geisinger Clinc (Richfield, PA). 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 Calvin Mah's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Calvin Mah affiliated with any hospitals?
According to CMS data, Calvin Mah is affiliated with Upmc Pinnacle Hospitals and Milton S Hershey Medical Center.
When was this NPI record last updated?
The NPPES record for Calvin Mah was last updated on June 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Calvin Brian Mah, CRNA · NPI 1285870253
Nurse Anesthetist, Certified Registered physician in Harrisburg, Pennsylvania. Individual provider, active in the CMS NPPES registry since December 23, 2008.
## Identity
- **NPI:** 1285870253 (Entity type: Individual)
- **Enumerated:** December 23, 2008
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** RN570026 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 4300 LONDONDERRY RD, Harrisburg, PA 17109-5317
- **Phone:** (717) 782-5118 · **Fax:** (717) 782-5854
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Penn State Health Medical Group, LLC (NPI 1457824013, Harrisburg, PA); Upmc Pinnacle Anesthesia Services, LLC (NPI 1730693979, Harrisburg, PA); The Milton S. Hershey Medical Center Physicians Group (NPI 1760430342, Middletown, PA); Hershey Anesthesia LLC (NPI 1861429128, Hershey, PA); Geisinger Clinc (NPI 1326537564, Richfield, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Pittsburgh School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** June 22, 2026
- **Other identifiers:** Medicaid 1022567420004 (PA)
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Source: [NPI Profile](https://npiprofile.com/npi/1285870253) · Data from the CMS NPPES public registry.