Mark Collar, M.D.
NPI 1659354553 · Anesthesiology Physician · Monroe, WI
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Collar, M.D. is a Anesthesiology Physician provider in Monroe, WI (NPI 1659354553).
Provider details
- NPI number
- 1659354553
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 38554 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
162 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Anesthesia for Exam of Colon Using an Endoscope00812 | 57 | $44 |
| Anesthesia for Other Procedure on Large Bowel Using an Endoscope00811 | 51 | $54 |
| Anesthesia for Other Procedure on Esophagus, Stomach, Or Upper Small Bowel Using an Endoscope00731 | 38 | $62 |
| Anesthesia for Procedure on Small and Large Bowel Using an Endoscope00813 | 16 | $65 |
Typical Medicare-allowed amounts for these services range $44–$65 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-23
- Last updated
- 2017-02-21
Frequently asked questions
- What is Mark Collar's NPI number?
- Mark Collar's National Provider Identifier (NPI) is 1659354553, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Collar's specialty?
- Mark Collar is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Collar located?
- Mark Collar's practice location on file with NPPES is 515 22nd Ave, Monroe, WI 53566-1569.
- What is Mark Collar's phone number?
- The practice phone number listed in the NPPES registry for Mark Collar is (608) 324-2222.
- Does Mark Collar accept Medicare?
- Mark Collar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Collar's NPI active?
- Yes — Mark Collar's NPI (1659354553) is active in the NPPES registry as of the last update on 2017-02-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.