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DR. ROBERT MASSOP D.O.
NPI 1437546470
Anesthesiology in Madison, WI

Active since April 16, 2015PECOS EnrolledAccepts Medicare Assignment
600 HIGHLAND AVE, MADISON, WI 53792(608) 263-8114 Get Directions Write a Review

NPPES record last updated: February 14, 2017. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Robert Massop D.o. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROBERT MASSOP D.O. (NPI 1437546470) is an individual anesthesiology provider in Madison, Wisconsin, licensed in Wisconsin (66536) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, is affiliated with Aspirus Rhinelander Hospital, and is a graduate of Other (2015).

NPPES Registry Identity

NPI1437546470
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameDR. ROBERT MASSOPCredential: D.O.
Location Address600 HIGHLAND AVEMadison, WI 53792
Mailing Address600 Highland AveMadison, WI 53792
Phone(608) 263-8114
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateApril 16, 2015
Last NPPES UpdateFebruary 14, 2017
✔ NPI 1437546470 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in WI · 66536
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
600 HIGHLAND AVE, Madison, WI 53792
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Robert Massop D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9234447970
PECOS Enrollment IDI20190626001365
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

6

Medicare enrollment records show Robert Massop reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Aspirus Riverview Hospital & Clinics, Inc.
64 mi
Multi-Specialty
419 N OAK ST
Adams, WI 53910
  • Reassigned Medicare billing, Wisconsin enrollment
  • 397 clinicians in this Medicare group
NPI 1114411287 (608) 339-5250
Mchs Hospitals Inc
92 mi
Clinic/Center
440 24TH ST S
Wisconsin Rapids, WI 54494
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,476 clinicians in this Medicare group
NPI 1568188589 (715) 751-6200
Aspirus Rhinelander & Tomahawk Hospitals & Clinics, Inc.
95 mi
Clinic/Center
272 CHRISTY ST
Amherst, WI 54406
  • Reassigned Medicare billing, Wisconsin enrollment
  • 935 clinicians in this Medicare group
NPI 1316616428 (715) 824-5151
Marshfield Clinic Inc
116 mi
Clinic/Center
1000 N OAK AVE
Marshfield, WI 54449
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,540 clinicians in this Medicare group
NPI 1952347981 (715) 387-5511
Bellin Anesthesia Associates, S.C.
121 mi
Pain Medicine
744 S WEBSTER AVE
Green Bay, WI 54301
  • Reassigned Medicare billing, Wisconsin enrollment
  • Medicare enrollment name: Bellin Anesthesia Associates Sc
  • 61 clinicians in this Medicare group
NPI 1558318410 (920) 433-3500
Central Wisconsin Anesthesiology
131 mi
Anesthesiology
425 PINE RIDGE BOULEVARD, SUITE 211
Wausau, WI 54401
  • Reassigned Medicare billing, Wisconsin enrollment
  • 53 clinicians in this Medicare group
NPI 1518999648 (715) 845-5505

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Insertion of artery tube for blood sampling or infusion through skin 36620
This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.
25 services25 patients
Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) 64447
This procedure involves injecting a numbing agent and/or steroid into a nerve in your thigh. It's done to alleviate pain or inflammation. A needle will be carefully positioned near the nerve, and the medicine will be administered.
21 services21 patients
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
17 services17 patients
Anesthesia for procedure for total knee joint replacement 01402
Anesthesia for a total knee joint replacement numbs your body to eliminate pain during surgery. This could be general anesthesia where you're unconscious, or regional anesthesia where only the leg is numb. It's administered by a specialist, ensuring safety and comfort.
16 services16 patients
Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
14 services13 patients
Anesthesia for x-ray or radiation therapy 01922
Anesthesia for x-ray or radiation therapy involves administering medication to help you relax or sleep during the procedure. It's used to ensure comfort, minimize movement, and reduce anxiety. The type of anesthesia used depends on the procedure and patient's health.
12 services12 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Aspirus Rhinelander Hospital

Acute Care Hospitals · Rhinelander, WI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520019
Location2251 North Shore DrRhinelander, WI 54501 · Oneida County
Emergency services Birthing friendly

Aspirus Wausau Hospital

Acute Care Hospitals · Wausau, WI
4/5 CMS rating
OwnershipProprietary
CMS Certification Number520030
Location333 Pine Ridge BlvdWausau, WI 54401 · Marathon County
Emergency services Birthing friendly

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JASON ALAN CHRISTENSEN PHARMD
Pharmacist
600 HIGHLAND AVE, COMPLIANCE MAIL CODE 2433
MADISON, WI 53792
Dane County (608) 662-0817
LAURA JEAN KOPPLIN MD, PHD
Ophthalmology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-6070
HAGGI MAZEH MD
Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 265-8072
DR. SWAPNIL SUNIL LANJEWAR M.D.
Internal Medicine (Infectious Disease)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-0946
DR. MATTHEW JAMES HOYT M.D.
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
VANESSA MERCEDES WELTEN MD MPH
Transplant Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (617) 732-5500
JOHN HENRY NORMAN HARRISON
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
PIPPA FROUKTE COSPER MD
Radiology (Radiation Oncology)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8500

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Massop's NPI number?

The NPI number for Robert Massop is 1437546470. It was assigned to this individual provider in the NPPES registry on April 16, 2015.

Where is Robert Massop located?

Robert Massop practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-8114.

What is Robert Massop's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Robert Massop enrolled in Medicare?

Yes. Robert Massop is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Robert Massop's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Massop reassigns Medicare benefits to 6 organizations: Aspirus Riverview Hospital & Clinics, Inc. (Adams, WI), Mchs Hospitals Inc (Wisconsin Rapids, WI), Aspirus Rhinelander & Tomahawk Hospitals & Clinics, Inc. (Amherst, WI), Marshfield Clinic Inc (Marshfield, WI), Bellin Anesthesia Associates, S.C. (Green Bay, WI) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Robert Massop's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Robert Massop affiliated with any hospitals?

According to CMS data, Robert Massop is affiliated with Aspirus Rhinelander Hospital and Aspirus Wausau Hospital.

When was this NPI record last updated?

The NPPES record for Robert Massop was last updated on February 14, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.