David J. Irwin, MD
Neurology Physician · Philadelphia, PA
David J. Irwin, MD is a neurology physician with a practice address in Philadelphia, Pennsylvania, and NPI 1194986356, issued on Jun 20, 2008. Check the license (Pennsylvania MD439211, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- David J. Irwin
- Credential
- MD
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- MD439211 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3400 Spruce Street, Philadelphia, PA 19104
- Phone
- (215) 662-3606
- Enumerated
- Jun 20, 2008
- Record last updated
- May 30, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110901000224); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 1,077 in Pennsylvania → Look up another NPI →
Also registered at 3400 Spruce Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephanie Abbuhl, MDEmergency Medicine Physician1649215195
- Shahrzad Abdollahi, M.D.Rheumatology Physician1518494178
- Sarah Abdulla, MDVascular & Interventional Radiology Physician1427342336
- Alice Abernathy, MDObstetrics & Gynecology Physician1740711498
- Mariam Aboian, M.D., PH.D.Diagnostic Radiology Physician1356669386
- Samir Abu Gazala, M.D.Surgery Physician1750708251
Verify David J. Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD439211Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average neurology physician in 2024
1,030 Medicare Part D claims for 186 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Sertraline Hcl164 claims
- Donepezil Hcl128 claims
- Trazodone Hcl124 claims
- Quetiapine Fumarate110 claims
- Memantine Hcl79 claims
- Clonazepam69 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 85.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- University OF Penn - Medical GroupPhiladelphia, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David J. Irwin among 1,077 neurology physician records in Pennsylvania
David J. Irwin, MD is one of 1,077 neurology physician records with a practice address in Pennsylvania. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 45% of them.
- NPI issued2008 · 45% of these records are older, 50% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2006 · median 2007 among the 727 with a school on file
- Record last updated2014 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in Pennsylvania
There are 1,077 neurology physician records in Pennsylvania.
All 1,077 in Pennsylvania → Every provider in Philadelphia → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Laura Balcer, MDPhiladelphia, PA 191041902838121
- Charles Cantor, MDPhiladelphia, PA 191041225066244
- Harry Coslett, MDPhiladelphia, PA 191041326088329
- Joseph Dalmau, MDPhiladelphia, PA 191041376575506
- Ramon Diaz-Arrastia, MDPhiladelphia, PA 191041194785774
- Marc Dichter, MDPhiladelphia, PA 191041043242282
- Lauren Elman, MDPhiladelphia, PA 191041942231766
- Rollin Gallagher, MD MPHPhiladelphia, PA 191041932136835
Common questions
What is David J. Irwin, MD's NPI number?
David J. Irwin, MD's National Provider Identifier (NPI) is 1194986356, issued on Jun 20, 2008. An NPI identifies a provider in billing; it is not a license.
Where is David J. Irwin, MD located?
The NPPES record lists a practice address at 3400 Spruce Street, Philadelphia, PA, 19104. Phone: (215) 662-3606. Providers update this record themselves, so call before visiting.
How can I verify David J. Irwin, MD's license?
NPPES lists Pennsylvania license number MD439211, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David J. Irwin, MD prescribe under Medicare Part D?
In 2024, David J. Irwin, MD had 1,030 Medicare Part D claims for 186 beneficiaries; the average among neurology physician prescribers was 1,370. Part D covers Medicare prescriptions only.
What is David J. Irwin, MD's MIPS final score?
The 2023 MIPS final score is 85.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.