Quick answers
- Does Christine R. Grassman accept Medicare assignment?
- Yes. Medicare's clinician data says Christine R. Grassman 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 Christine R. Grassman see?
- In 2024, CMS data shows 54 Original Medicare patients and 89 services for Christine R. Grassman. This counts Original Medicare only and measures volume, not quality.
- What is Christine R. Grassman's NPI number?
- 1689111817. 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 Christine R. Grassman, 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 | 54 |
|---|---|
| Services billed to Medicare | 89 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)26 services
- Hemoglobin a1c level (83036)21 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 blood pressure69%
- High cholesterol61%
- Arthritis39%
- Diabetes35%
- Chronic kidney disease28%
- Anxiety24%
Hospitals where Christine R. Grassman works
Medicare's Facility Affiliation Data lists Christine R. Grassman 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.
- Canyon Vista Medical CenterSierra Vista, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030043
Practice locations
Addresses where Christine R. Grassman is enrolled with Medicare (CMS data updated October 2, 2026).
- 155 Calle Portal, Suite 700Sierra Vista, AZ 85635 (520) 364‑6852
Group practices
Medicare enrollment lists Christine R. Grassman as a member of this group (CMS data updated October 2, 2026).
- Chiricahua Community Health Centers Inc44 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Sierra Vista
Clinicians with the same Medicare primary specialty in Sierra Vista, AZ — not a recommendation.
Other clinicians in Chiricahua Community Health Centers Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689111817 |
| 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