William P. Diefenbach
- Medicare services, 2021
- 61
- Part D claims, 2021
- 14
- Hospital affiliations
- 1
- Industry payments
- $12,847
- Medical groups
- 7
- Practice address
- 4100 Allequippa St, Pittsburgh, PA 15213
- Practice phone
- Call (202) 382-2579
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Pittsburgh VAMC
Pittsburgh, Pennsylvania
Find William Diefenbach's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
William P. Diefenbach is a neurosurgeon in Pittsburgh, Pennsylvania
William Diefenbach practices at Pittsburgh VAMC in Pittsburgh, Pennsylvania.
William Diefenbach's NPI, 1740268812, was assigned on January 9, 2006. William Diefenbach graduated from Columbia University College of Physicians and Surgeons in 1979. William Diefenbach holds Pennsylvania license MD050177L.
- NPI
- 1740268812NPI Registry (opens in a new tab)
- NPI enumeration date
- January 9, 2006
- NPI status
- Active
- Practice phone
- (202) 382-2579
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
William P. Diefenbach practices at Pittsburgh VAMC in Pittsburgh, Pennsylvania
William Diefenbach's primary practice is Pittsburgh VAMC, at 4100 Allequippa St, Pittsburgh, PA 15213 in Allegheny County. The practice phone is (202) 382-2579.
- Pittsburgh VAMC4100 Allequippa St, Pittsburgh, PA 15213 · Allegheny CountyPhone(202) 382-2579
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
William P. Diefenbach is affiliated with 4 sites of care and 7 medical groups
William Diefenbach's primary practice is Pittsburgh VAMC in Pittsburgh, Pennsylvania. William Diefenbach is also affiliated with UPMC Hamot. The medical group on file is AHN Primary Care - Family Med Associates at H+W Pavilion Bethel Park. Dmand AI also links William Diefenbach to 6 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at William P. Diefenbach's practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Diefenbach practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Pittsburgh VAMC | Available with a free account |
| +3 more sites and 6 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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William P. Diefenbach is one of 367 neurosurgeons in Pennsylvania
Neurological surgery is William Diefenbach's primary specialty in the NPI Registry, under taxonomy code 207T00000X. William Diefenbach is licensed in Pennsylvania.
Specialties and state licenses
- Neurological surgery, PennsylvaniaPrimary
Neurosurgeons near William Diefenbach
Counts of neurosurgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
William P. Diefenbach billed Medicare for 61 services in 2021
CMS data shows 61 Medicare services from William Diefenbach across 3 procedure codes in 2021. Medicare paid $6,071 for them.
William Diefenbach's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 1122021: 5055%
- Surgery
- 2020: 492021: 1178%
Where William Diefenbach's Medicare services took place, 2021
- In an office5082%
- In a facility1118%
William Diefenbach compared with the Pennsylvania median for neurosurgeons, 2021
- William Diefenbach
- Pennsylvania median
- Medicare services
- 61vs 19769% below
- Part D claims
- 14vs 2748% below
Medians across 316 neurosurgeons in Pennsylvania with Dmand AI profiles that report each measure.
William Diefenbach's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for William Diefenbach and other neurosurgeons in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
William P. Diefenbach's patients have a median age of 70
Across all payers, Dmand AI patient panel data puts William Diefenbach's median patient age at 70, with 48% women.
William Diefenbach's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women48%
- Men52%
Source: Dmand AI Patient Panel Data
William P. Diefenbach wrote 14 Medicare Part D claims in 2021
In 2021, William Diefenbach wrote 14 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $62 in total drug cost. In 2020, CMS named 45 claims across 2 drugs.
William Diefenbach's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 452021: 1469%
Drugs named by CMS: 1 in 2021, 2 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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William P. Diefenbach received $12,847 in industry payments from 2016 to 2025
CMS Open Payments shows 296 general payments to William Diefenbach from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 57% of the total. Boston Scientific Corporation paid the most, $6,669.
General payments to William Diefenbach by program year, 2016 to 2025
General payments to William Diefenbach by kind, 2016 to 2025
- Food and beverage$7,33357%
- Travel and lodging$5,39842%
- Entertainment$1161%
Companies that paid William Diefenbach the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
William P. Diefenbach graduated from Columbia University College of Physicians and Surgeons
William Diefenbach graduated from Columbia University College of Physicians and Surgeons in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for William P. Diefenbach's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about William P. Diefenbach
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William P. Diefenbach's NPI number?
William P. Diefenbach's NPI number is 1740268812. It was assigned on January 9, 2006, and it is active in the NPI Registry.
What does William P. Diefenbach specialize in?
William P. Diefenbach is a neurosurgeon in Pittsburgh, Pennsylvania. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).
Where does William P. Diefenbach practice?
William Diefenbach practices at 4100 Allequippa St, Pittsburgh, PA 15213. William Diefenbach's primary practice is Pittsburgh VAMC in Pittsburgh, Pennsylvania. Dmand AI also links William Diefenbach to 6 medical groups and 2 group practices and clinics.
What is William P. Diefenbach's office phone number?
The practice phone on file for William Diefenbach is (202) 382-2579.
What is William P. Diefenbach's medical license number?
William Diefenbach holds Pennsylvania license MD050177L.
Which hospitals is William P. Diefenbach affiliated with?
William Diefenbach is affiliated with UPMC Hamot.
What medical group is William P. Diefenbach part of?
William Diefenbach is linked to AHN Primary Care - Family Med Associates at H+W Pavilion Bethel Park. Dmand AI links William Diefenbach to 6 more medical groups.
Does William P. Diefenbach accept Medicare?
Yes. CMS data shows William Diefenbach billed Medicare for 61 services in 2021.
What services does William P. Diefenbach bill to Medicare?
In 2021, William Diefenbach's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99203) and surgery: brain, spine and nerves (63688).
Where did William P. Diefenbach go to medical school?
William Diefenbach graduated from Columbia University College of Physicians and Surgeons in 1979.
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What drugs does William P. Diefenbach prescribe most?
In 2021 Medicare Part D data, William Diefenbach's most prescribed drugs by claims were Cefadroxil.
Has William P. Diefenbach received payments from drug or device companies?
CMS Open Payments shows $12,847 in general payments to William Diefenbach from 39 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has William P. Diefenbach been practicing?
William Diefenbach graduated from medical school in 1979, 47 years ago.
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