Warren A. Hammerschlag, MD
Orthopaedic Surgery Physician · Paramus, NJ
Warren A. Hammerschlag, MD is an orthopaedic surgery physician with a practice address in Paramus, New Jersey, and NPI 1104981679, issued on Dec 26, 2006. Check the license (New Jersey 25MA05170900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Warren A. Hammerschlag
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License numbers
- 25MA05170900 NJ
1572891 NY
Self-reported in NPPES; status is on the state search - Practice location
- 22 Madison Ave, Paramus, NJ 07652
- Phone
- (201) 977-6960
- Enumerated
- Dec 26, 2006
- Record last updated
- Aug 13, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (201) 977-6961
- Medicaid ID
- 7988401 NJ
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 690 in New Jersey → Look up another NPI →
Also registered at 22 Madison Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Warren A. Hammerschlag in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA05170900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
41 Medicare Part D claims, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D.
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.
Warren A. Hammerschlag among 690 orthopaedic surgery physician records in New Jersey
Warren A. Hammerschlag, MD is one of 690 orthopaedic surgery physician records with a practice address in New Jersey. 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 42% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2015 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 orthopaedic surgery physician records list a practice address in Paramus
They are 17 of the 1,842 NPPES records with a practice address in Paramus, and 690 orthopaedic surgery physician records in New Jersey.
All 690 in New Jersey → Every provider in Paramus → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Michael Ast, M.D.Paramus, NJ 076521427204106
- Andrew Beharrie, M.D.Paramus, NJ 076521952361982
- Michael Distefano, MDParamus, NJ 076521407883887
- Mark Hartzband, MDParamus, NJ 076521386639722
- Seth Kane, MDParamus, NJ 076521679614358
- Gregg Klein, MDParamus, NJ 076521528053642
- Eitan Kohan, M.D.Paramus, NJ 076521619358207
- Ajay Lall, M.D., M.S.Paramus, NJ 076521639451214
Common questions
What is Warren A. Hammerschlag, MD's NPI number?
Warren A. Hammerschlag, MD's National Provider Identifier (NPI) is 1104981679, issued on Dec 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Warren A. Hammerschlag, MD located?
The NPPES record lists a practice address at 22 Madison Ave, Paramus, NJ, 07652. Phone: (201) 977-6960. Providers update this record themselves, so call before visiting.
How can I verify Warren A. Hammerschlag, MD's license?
NPPES lists New Jersey license number 25MA05170900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Warren A. Hammerschlag, MD prescribe under Medicare Part D?
In 2024, Warren A. Hammerschlag, MD had 41 Medicare Part D claims; the average among orthopaedic surgery physician prescribers was 346. 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.