Regan Chan, D.O.
NPI 1558546341 · Family Medicine Physician · Orange, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Regan Chan, D.O. is a Family Medicine Physician provider in Orange, CA (NPI 1558546341).
Provider details
- NPI number
- 1558546341
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A10204 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
526 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 193 | $133 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 130 | $18 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 101 | $96 |
| Administration of Influenza Virus VaccineG0008 | 45 | $35 |
| Admn Sarscov2 Vacc 1 Dose90480 | 36 | $47 |
| Administration of Pneumococcal VaccineG0009 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 165 | 52 |
| Levothyroxine Sodium | 117 | 28 |
| Losartan Potassium | 87 | 25 |
| Amlodipine Besylate | 86 | 24 |
| Metformin Hcl | 77 | 29 |
| Tamsulosin Hcl | 67 | 19 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-12-31
- Last updated
- 2022-11-03
- Certified
- 2022-11-03
Frequently asked questions
- What is Regan Chan's NPI number?
- Regan Chan's National Provider Identifier (NPI) is 1558546341, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Regan Chan's specialty?
- Regan Chan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Regan Chan located?
- Regan Chan's practice location on file with NPPES is 293 S Main St, Orange, CA 92868-3843.
- What is Regan Chan's phone number?
- The practice phone number listed in the NPPES registry for Regan Chan is (714) 838-8848.
- Does Regan Chan accept Medicare?
- Regan Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Regan Chan's NPI active?
- Yes — Regan Chan's NPI (1558546341) is active in the NPPES registry as of the last update on 2022-11-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.