DONALD S. DIEFENDORF P.A.-C
NPI 1437187002
Physician Assistant - Medical in Baltimore, MD

Q: What is Donald Diefendorf's NPI number?

The NPI number for Donald Diefendorf is 1437187002. It was assigned to this individual provider in the NPPES registry on June 30, 2006.

Q: What is Donald Diefendorf's specialty?

The primary specialty registered for this NPI is Physician Assistant, specializing in Medical, with taxonomy code 363AM0700X.

Q: When was this NPI record last updated?

The NPPES record for Donald Diefendorf was last updated on December 5, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since June 30, 2006PECOS EnrolledAccepts Medicare Assignment

2700 QUARRY LAKE DR STE 300, BALTIMORE, MD 21209(410) 377-8900(410) 377-0576 Get Directions Write a Review

NPPES record last updated: December 5, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Dec 5, 2025, Mar 4, 2019, May 22, 2018 (3 updates tracked since 2018).

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About Donald S. Diefendorf P.a.-c NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DONALD S. DIEFENDORF P.A.-C (NPI 1437187002) is an individual medical provider in Baltimore, Maryland, licensed in Pennsylvania (MA002841L) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Mercy Medical Center Inc, and maintains a secondary practice location in Hanover.

NPPES Registry Identity

NPI1437187002

Entity TypeIndividualMale

Primary Taxonomy363AM0700X

Provider Legal NameDONALD S. DIEFENDORFCredential: P.A.-C

Location Address2700 QUARRY LAKE DR STE 300Baltimore, MD 21209

Mailing Address601 Memory LnYork, PA 17402-2123 · (717) 851-1405

Phone(410) 377-8900

Fax(410) 377-0576

Sole ProprietorNo

Medical School CMSOtherGraduated 1998

Enumeration DateJune 30, 2006

Last NPPES UpdateDecember 5, 20253 updates tracked since enumeration

NPPES CertifiedDecember 5, 2025

✔ NPI 1437187002 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician Assistant · MedicalPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363AM0700X

Licenses✔ Licensed in PA · MA002841L✔ Licensed in MD · C0002134

2700 QUARRY LAKE DR STE 300, Baltimore, MD 21209

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Secondary Practice Location 1

Location 11227 Baltimore StHanover, PA 17331-4406 · Phone (717) 812-2055

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Donald S. Diefendorf P.a.-c 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.

PECOS PAC ID8820006935

PECOS Enrollment IDI20060331000326, I20251215001595

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 10

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

83 services60 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

69 services64 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

57 services57 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

46 services37 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

43 services31 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

26 services26 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Medical Center Inc

Acute Care Hospitals · Baltimore, MD

4/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number210008

Location301 Saint Paul PlaceBaltimore, MD 21202 · Baltimore City County

Emergency services Birthing friendly

Gettysburg Hospital

Acute Care Hospitals · Gettysburg, PA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number390065

Location147 Gettys StreetGettysburg, PA 17325 · Adams County

Emergency services Birthing friendly

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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.

ARIANA KARNADO PA-C

Physician Assistant