Quick answers
- Does Allen W. Cortez accept Medicare assignment?
- Yes. Medicare's clinician data says Allen W. Cortez 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 Allen W. Cortez see?
- In 2024, CMS data shows 300 Original Medicare patients and 652 services for Allen W. Cortez. This counts Original Medicare only and measures volume, not quality.
- What is Allen W. Cortez's NPI number?
- 1518916089. 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 Allen W. Cortez, 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 | 300 |
|---|---|
| Services billed to Medicare | 652 |
| Different services or procedures | 95 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)106 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)93 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)74 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)46 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)33 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%
- Arthritis44%
- Anxiety33%
- Diabetes29%
- Chronic kidney disease27%
Hospitals where Allen W. Cortez works
Medicare's Facility Affiliation Data lists Allen W. Cortez 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.
- California Pacific Medical Center-Davies Campus HospitalSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050008
- Sutter Santa Rosa Regional HospitalSanta Rosa, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050291
Practice locations
Addresses where Allen W. Cortez is enrolled with Medicare (CMS data updated October 2, 2026).
- 30 Mark W Springs RdSanta Rosa, CA 95403 (707) 576‑4500
- 34 Mark W Springs RdSanta Rosa, CA 95403
- 3883 Airway DrSanta Rosa, CA 95403
Group practices
Medicare enrollment lists Allen W. Cortez as a member of this group (CMS data updated October 2, 2026).
- Sutter Bay Medical Foundation3,829 clinicians in the group
Specialties
- General Surgeryprimary
- Emergency Medicinealso
Other general surgeons in Santa Rosa
Clinicians with the same Medicare primary specialty in Santa Rosa, CA — not a recommendation.
Other clinicians in Sutter Bay Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1518916089 |
| 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