Quick answers
- Does Stewart G. Allen accept Medicare assignment?
- Yes. Medicare's clinician data says Stewart G. Allen 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 Stewart G. Allen see?
- In 2024, CMS data shows 1,021 Original Medicare patients and 3,238 services for Stewart G. Allen. This counts Original Medicare only and measures volume, not quality.
- What is Stewart G. Allen's NPI number?
- 1205034030. 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 Stewart G. Allen, 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 | 1,021 |
|---|---|
| Services billed to Medicare | 3,238 |
| Different services or procedures | 87 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)649 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)625 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)280 services
- Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes (99349)173 services
- Programming of dual lead pacemaker system (93280)155 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%
- Ischemic heart disease46%
- Arthritis45%
- Atrial fibrillation35%
- Diabetes33%
Hospitals where Stewart G. Allen works
Medicare's Facility Affiliation Data lists Stewart G. Allen 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.
- Adventist Health ClearlakeClearlake, CA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 051317
- Adventist Health Howard MemorialWillits, CA · Critical Access Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 051310
- Adventist Health Mendocino CoastFort Bragg, CA · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 051325
- Adventist Health St HelenaSaint Helena, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050013
- Adventist Health Ukiah ValleyUkiah, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050301
Practice locations
Addresses where Stewart G. Allen is enrolled with Medicare (CMS data updated October 2, 2026).
- 10 Woodland RdSaint Helena, CA 94574 (707) 967‑5721
- 6 Woodland Rd, Suite 202Saint Helena, CA 94574 (707) 968‑0670
- 913 Washington StCalistoga, CA 94515
- 999 Adams St, Suite 106Saint Helena, CA 94574 (707) 963‑4997
Group practices
Medicare enrollment lists Stewart G. Allen as a member of these groups (CMS data updated October 2, 2026).
- Adventist Health Physicians Network628 clinicians in the group
- St. Helena Hospital84 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in Saint Helena
Clinicians with the same Medicare primary specialty in Saint Helena, CA — not a recommendation.
Other clinicians in Adventist Health Physicians Network
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wake Forest University School Of Medicine |
| Graduation year | 2001 (25 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) | 1205034030 |
| 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