Mark B. Irwin, M.D.
Urology Physician · Brooklyn, NY
Mark B. Irwin, M.D. is a urology physician with a practice address in Brooklyn, New York, and NPI 1508860263, issued on Jun 10, 2005. Check the license (New York 1685650, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark B. Irwin
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License number
- 1685650 NY
Self-reported in NPPES; status is on the state search - Practice location
- 359 Clinton St, Brooklyn, NY 11231
- Phone
- (646) 460-1479
- Enumerated
- Jun 10, 2005
- Record last updated
- Apr 19, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (718) 875-7864
- Medicaid ID
- 01128523 NY
- Medicare enrollment
- Enrolled (PECOS I20091201000204); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,091 in New York → Look up another NPI →
Also registered at 359 Clinton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eric Kenworthy, MDInternal Medicine Physician1174537583
Verify Mark B. Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 1685650Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average urology physician in 2024
376 Medicare Part D claims for 92 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Tamsulosin Hcl183 claims
- Finasteride62 claims
- Dutasteride39 claims
- Ciprofloxacin Hcl19 claims
- Sulfamethoxazole-Trimethoprim14 claims
- Silodosin12 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.
Mark B. Irwin among 1,091 urology physician records in New York
Mark B. Irwin, M.D. is one of 1,091 urology physician records with a practice address in New York. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1982 · median 2000 among the 735 with a school on file
- Record last updated2017 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in New York
There are 1,091 urology physician records in New York.
All 1,091 in New York → Every provider in Brooklyn → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Jude Barbera, MDBrooklyn, NY 112291750451613
- Stephen Baumgarten, MDBrooklyn, NY 112291033110960
- Sumit De, M.D.Brooklyn, NY 112291861642571
- Ben Jacobs, MDBrooklyn, NY 112291093740300
- Jonathan Lazare, MDBrooklyn, NY 112291376552406
- Isaac Madeb, MDBrooklyn, NY 112291467452086
- Edmund Mandel, MDBrooklyn, NY 112291972531366
- Abraham Ostad, MDBrooklyn, NY 112291568476968
Common questions
What is Mark B. Irwin, M.D.'s NPI number?
Mark B. Irwin, M.D.'s National Provider Identifier (NPI) is 1508860263, issued on Jun 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark B. Irwin, M.D. located?
The NPPES record lists a practice address at 359 Clinton St, Brooklyn, NY, 11231. Phone: (646) 460-1479. Providers update this record themselves, so call before visiting.
How can I verify Mark B. Irwin, M.D.'s license?
NPPES lists New York license number 1685650, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark B. Irwin, M.D. prescribe under Medicare Part D?
In 2024, Mark B. Irwin, M.D. had 376 Medicare Part D claims for 92 beneficiaries; the average among urology physician prescribers was 1,340. Part D covers Medicare prescriptions only.
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.