Quick answers
- Does Theodore J. Quilligan accept Medicare assignment?
- Yes. Medicare's clinician data says Theodore J. Quilligan 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 Theodore J. Quilligan see?
- In 2024, CMS data shows 205 Original Medicare patients and 212 services for Theodore J. Quilligan. This counts Original Medicare only and measures volume, not quality.
- What is Theodore J. Quilligan's NPI number?
- 1245251768. 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 Theodore J. Quilligan, 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 | 205 |
|---|---|
| Services billed to Medicare | 212 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Anesthesia for other procedure on lower abdomen (00840)48 services
- Anesthesia for other procedure on nose and sinuses (00160)21 services
- Anesthesia for injection, drainage or aspiration procedures on spine or spinal cord of lower back accessed through skin using imaging guidance (01938)17 services
- Anesthesia for other procedure on neck area (1 year or older) (00320)13 services
- Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)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 cholesterol75%
- High blood pressure67%
- Arthritis49%
- Ischemic heart disease25%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)21%
- Diabetes19%
Practice locations
Addresses where Theodore J. Quilligan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1100 W Stewart DrOrange, CA 92868 (714) 744‑8700
Group practices
Medicare enrollment lists Theodore J. Quilligan as a member of this group (CMS data updated October 2, 2026).
- Allied Anesthesia Medical Group Inc191 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Orange
Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.
Other clinicians in Allied Anesthesia Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Cincinnati College Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245251768 |
| 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