Quick answers
- Does William M. Coburn Iii accept Medicare assignment?
- Yes. Medicare's clinician data says William M. Coburn Iii 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 William M. Coburn Iii see?
- In 2024, CMS data shows 461 Original Medicare patients and 717 services for William M. Coburn Iii. This counts Original Medicare only and measures volume, not quality.
- What is William M. Coburn Iii's NPI number?
- 1770698920. 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 William M. Coburn Iii, 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 | 461 |
|---|---|
| Services billed to Medicare | 717 |
| Different services or procedures | 40 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)222 services
- Emergency department visit with high level of medical decision making (99285)207 services
- Critical care, first 30-74 minutes (99291)87 services
- Emergency department visit with moderate level of medical decision making (99284)60 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)26 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%
- Arthritis61%
- Diabetes50%
- Ischemic heart disease49%
- Chronic kidney disease41%
Hospitals where William M. Coburn Iii works
Medicare's Facility Affiliation Data lists William M. Coburn Iii 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.
- Huntington HospitalPasadena, CA · Acute Care Hospital · Emergency services: listed by Medicare · CCN 050438
Practice locations
Addresses where William M. Coburn Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 W California BlvdPasadena, CA 91105
- 26777 Agoura Rd, Suite B4Calabasas, CA 91302 (818) 880‑2225
Group practices
Medicare enrollment lists William M. Coburn Iii as a member of these groups (CMS data updated October 2, 2026).
- Exer Medical Corporation340 clinicians in the group
- HMH Emergency Medical Group, Inc.60 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Pasadena
Clinicians with the same Medicare primary specialty in Pasadena, CA — not a recommendation.
Other clinicians in Exer Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1770698920 |
| 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