DONALD S. DIEFENDORF (P.A.-C) – Medical Physician Assistant, NPI 1437187002
Medical Physician Assistant
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
9,691 PHYSICIAN ASSISTANT in PA
Provider Addresses for DONALD S. DIEFENDORF (P.A.-C)
1227 Baltimore St
Hanover, PA 173314406
Phone: (717) 812-2055
Type: Location
Quarry Lake Drive, Greengate, Towson, Baltimore County, Maryland, 21209, United States
BALTIMORE, MD 212093746
Phone: (410) 377-8900
Fax: (410) 377-0576
Type: Mailing
601 MEMORY LN
YORK, PA 174022123
Phone: (717) 851-1405
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 54 Open Payments records for all available years, with a total value of $1,072.
Total Amount is formed as General ($1,072) + Research ($0) + Ownership ($0) = $1,072.
Last reported payment date: 2024-11-19 • Largest payer in this snapshot: Novo Nordisk Inc ($301).
Total Amount
$1,072
General + Research + Ownership
Payments
54
Total payment records
General Amount
$1,072
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novo Nordisk Inc | $301 |
| AstraZeneca Pharmaceuticals LP | $219 |
| Lilly USA, LLC | $135 |
| GlaxoSmithKline, LLC. | $132 |
| ABBVIE INC. | $110 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2025-12-15
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060331000326 | I | Physician Assistant | MD | TBD |
| I20251215001595 | I | Physician Assistant | PA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 128 | 84 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 62 | 49 | $0 |
| 93000 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 58 | 56 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 50 | 50 | $0 |
| 99442 | Telephone medical discussion with physician, 11-20 minutes | 25 | 22 | $0 |
Insurance plans in this area (ZIP 17331)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | PA | |
| - | PA | |
| - | PA | |
| N E U R O L O G Y | SC | |
| Physician Assistant | PA | |
| Hospitalist, Internal Medicine | PA | |
| Certified Registered Nurse Anesthetist (Crna) | PA | |
| Physician Assistant | PA | |
| Family Practice | PA | |
| Internal Medicine, Pulmonary Disease, Sleep Medicine | PA |
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