Robert Massop, D.O.
Anesthesiology Physician · Madison, WI
Robert Massop, D.O. is an anesthesiology physician with a practice address in Madison, Wisconsin, and NPI 1437546470, issued on Apr 16, 2015. Check the license (Wisconsin 66536, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Robert Massop
- Credential
- D.O.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- 66536 WI
Self-reported in NPPES; status is on the state search - Practice location
- 600 Highland Ave, Madison, WI 53792
- Phone
- (608) 263-8114
- Enumerated
- Apr 16, 2015
- Record last updated
- Feb 14, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190626001365); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,313 in Wisconsin → Look up another NPI →
Also registered at 600 Highland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael AabergSurgery Physician1346991064
- Carrah Aadrik, CRNACertified Registered Nurse Anesthetist1326423286
- Daniel Abbott, MDSurgical Oncology Physician1750412615
- Alaa Abd-ElsayedPain Medicine Physician1194967703
- Safiyya Abdulkadir, MDRheumatology Physician1093455826
- Edwin Abel, M.D.Urology Physician1083800510
Verify Robert Massop in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 66536Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $59.37
2 payments; by number, the most common kind was food and beverage; the largest payer was Haemonetics Corporation. The 17,774 providers of this specialty with any payment received $669.59 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 3 group practices
- Aspirus Rhinelander And Tomahawk Hospitals And Clinics, Inc.Rhinelander, WI
- Aspirus Riverview Hospital And Clinics IncWisconsin Rapids, WI
- Central Wisconsin AnesthesiologyWausau, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Massop among 1,313 anesthesiology physician records in Wisconsin
Robert Massop, D.O. is one of 1,313 anesthesiology physician records with a practice address in Wisconsin. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 77% of them.
- NPI issued2015 · 77% of these records are older, 20% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2015 · median 2006 among the 872 with a school on file
- Record last updated2017 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
280 anesthesiology physician records list a practice address in Madison
They are 280 of the 15,014 NPPES records with a practice address in Madison, and 1,313 anesthesiology physician records in Wisconsin.
All 1,313 in Wisconsin → Every provider in Madison → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Heather Abernethy, MDMadison, WI 537921104826288
- Srinivas Bollimpalli, MDMadison, WI 537921205806940
- James Fitzpatrick, MDMadison, WI 537921013983527
- Frederick Heiden, DOMadison, WI 537921982603957
- Jonathan Kay, M.D.Madison, WI 537921477537702
- Howard Lau, M.D.Madison, WI 537921053304915
- Dawn Ledbetter, MDMadison, WI 537921750381323
- Kathryn Ann McQueen, MDMadison, WI 537921972574168
Common questions
What is Robert Massop, D.O.'s NPI number?
Robert Massop, D.O.'s National Provider Identifier (NPI) is 1437546470, issued on Apr 16, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Robert Massop, D.O. located?
The NPPES record lists a practice address at 600 Highland Ave, Madison, WI, 53792. Phone: (608) 263-8114. Providers update this record themselves, so call before visiting.
How can I verify Robert Massop, D.O.'s license?
NPPES lists Wisconsin license number 66536, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.