Quick answers
- Does Margaret Z. Kozak accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret Z. Kozak 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 Margaret Z. Kozak see?
- In 2024, CMS data shows 664 Original Medicare patients and 1,991 services for Margaret Z. Kozak. This counts Original Medicare only and measures volume, not quality.
- What is Margaret Z. Kozak's NPI number?
- 1891781720. 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 Margaret Z. Kozak, 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 | 664 |
|---|---|
| Services billed to Medicare | 1,991 |
| Different services or procedures | 52 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)483 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)323 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)271 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)177 services
- Annual depression screening, 5 to 15 minutes (G0444)116 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 pressure69%
- Arthritis42%
- Ischemic heart disease24%
- Anxiety23%
- Diabetes22%
Hospitals where Margaret Z. Kozak works
Medicare's Facility Affiliation Data lists Margaret Z. Kozak at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Flagstaff Medical CenterFlagstaff, AZ · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 030023
- Verde Valley Medical CenterCottonwood, AZ · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 030007
Practice locations
Addresses where Margaret Z. Kozak is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 9; the Medicare profile lists all.
- 1200 N Beaver StFlagstaff, AZ 86001 (928) 779‑3366
- 1200 N Beaver St, Attn. Managed Care ContractingFlagstaff, AZ 86001
- 1215 N Beaver St, Suite 203Flagstaff, AZ 86001 (928) 773‑2249
- 2000 S Thompson StFlagstaff, AZ 86001 (928) 226‑6400
- 269 S Candy LnCottonwood, AZ 86326 (928) 639‑6000
Group practices
Medicare enrollment lists Margaret Z. Kozak as a member of this group (CMS data updated October 2, 2026).
- Northern Arizona Healthcare Corporation385 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Flagstaff
Clinicians with the same Medicare primary specialty in Flagstaff, AZ — not a recommendation.
Other clinicians in Northern Arizona Healthcare Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1891781720 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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