Quick answers
- Does Spencer J. Claussen accept Medicare assignment?
- Yes. Medicare's clinician data says Spencer J. Claussen 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 Spencer J. Claussen see?
- In 2024, CMS data shows 146 Original Medicare patients and 1,160 services for Spencer J. Claussen. This counts Original Medicare only and measures volume, not quality.
- What is Spencer J. Claussen's NPI number?
- 1255854246. 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 Spencer J. Claussen, 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 | 146 |
|---|---|
| Services billed to Medicare | 1,160 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)951 services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)117 services
- Psychiatric diagnostic evaluation with medical services (90792)39 services
- Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes (99310)26 services
- Nursing facility discharge management, more than 30 minutes (99316)13 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 pressure75%
- High cholesterol75%
- Arthritis59%
- Depression47%
- Anxiety47%
- Ischemic heart disease46%
Practice locations
Addresses where Spencer J. Claussen is enrolled with Medicare (CMS data updated October 2, 2026).
- 255 W Brown RdMesa, AZ 85201 (480) 833‑3988
- 4022 E Presidio StMesa, AZ 85215 (480) 985‑1093
- 4704 W Diana AveGlendale, AZ 85302 (623) 505‑9880
Group practices
Medicare enrollment lists Spencer J. Claussen as a member of these groups (CMS data updated October 2, 2026).
- Lifeline Hospitalist Associates LLC17 clinicians in the group
- Arizona Post Acute Care Specialists LLC10 clinicians in the group
- Ternion Physician Group, PLLC5 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Mesa
Clinicians with the same Medicare primary specialty in Mesa, AZ — not a recommendation.
Other clinicians in Lifeline Hospitalist Associates LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1255854246 |
| 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