Quick answers
- Does Ann Z. McColgin accept Medicare assignment?
- Yes. Medicare's clinician data says Ann Z. McColgin accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ann Z. McColgin see?
- In 2024, CMS data shows 574 Original Medicare patients and 2,350 services for Ann Z. McColgin. This counts Original Medicare only and measures volume, not quality.
- What is Ann Z. McColgin's NPI number?
- 1982799227. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ann Z. McColgin, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 574 |
|---|---|
| Services billed to Medicare | 2,350 |
| Different services or procedures | 44 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Measurement of corneal curvature and depth of eye (92136)277 services
- Established patient problem focused exam of visual system (92012)259 services
- Removal of cataract with insertion of prosthetic lens (66984)225 services
- Established patient complete exam of visual system (92014)216 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)167 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure66%
- Arthritis43%
- Ischemic heart disease23%
- Diabetes21%
- Chronic kidney disease20%
Practice locations
Addresses where Ann Z. McColgin is enrolled with Medicare (CMS data updated October 2, 2026).
- 6422 E Speedway Blvd, Suite 100Tucson, AZ 85710 (520) 325‑9400
Group practices
Medicare enrollment lists Ann Z. McColgin as a member of this group (CMS data updated October 2, 2026).
- Cornea Associates, PLLC6 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Tucson
Clinicians with the same Medicare primary specialty in Tucson, AZ — not a recommendation.
Other clinicians in Cornea Associates, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgia College Of Eclectric Medicine And Surgery |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982799227 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians