Nancy Sun, M.D.
NPI 1821146051 · Emergency Medicine Physician · Simi Valley, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nancy Sun, M.D. is a Emergency Medicine Physician provider in Simi Valley, CA (NPI 1821146051).
Provider details
- NPI number
- 1821146051
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A98171 (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
19 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
1,384 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 465 | $8 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 415 | $173 |
| Electrocardiogram (ecg) 1 to 3 Leads With Review By Physician Only93042 | 245 | $7 |
| Critical Care, First 30-74 Minutes99291 | 157 | $213 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 81 | $120 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 21 | $71 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 46 | 46 |
| Ondansetronbrand: Ondansetron Odt | 37 | 34 |
| Cefuroxime Axetilbrand: Cefuroxime | 32 | 32 |
| Cyclobenzaprine Hcl | 20 | 20 |
| Azithromycin | 19 | 19 |
| Pantoprazole Sodium | 15 | 15 |
| Metronidazole | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-05
- Last updated
- 2020-01-28
- Certified
- 2020-01-28
Frequently asked questions
- What is Nancy Sun's NPI number?
- Nancy Sun's National Provider Identifier (NPI) is 1821146051, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nancy Sun's specialty?
- Nancy Sun is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nancy Sun located?
- Nancy Sun's practice location on file with NPPES is 2975 Sycamore Dr, Simi Valley, CA 93065-1201.
- What is Nancy Sun's phone number?
- The practice phone number listed in the NPPES registry for Nancy Sun is (805) 955-6107.
- Does Nancy Sun accept Medicare?
- Nancy Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nancy Sun's NPI active?
- Yes — Nancy Sun's NPI (1821146051) is active in the NPPES registry as of the last update on 2020-01-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.