Ana Lopez-O'Sullivan, M.D.
NPI 1235363193 · Emergency Medicine Physician · Torrance, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ana Lopez-O'Sullivan, M.D. is a Emergency Medicine Physician provider in Torrance, CA (NPI 1235363193).
Provider details
- NPI number
- 1235363193
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A114378 (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
17 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
423 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 166 | $176 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 89 | $122 |
| Electrocardiogram (ecg) 1 to 3 Leads With Review By Physician Only93042 | 80 | $7 |
| Critical Care, First 30-74 Minutes99291 | 77 | $217 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 11 | $99 |
Typical Medicare-allowed amounts for these services range $7–$217 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 51 | 51 |
| Cefdinir | 37 | 37 |
| Naproxen | 21 | 21 |
| Famotidine | 20 | 20 |
| Prednisone | 18 | 18 |
| Oxycodone Hcl | 14 | 14 |
| Meclizine Hcl | 13 | 13 |
| Azithromycin | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-05-07
- Last updated
- 2014-06-16
Frequently asked questions
- What is Ana Lopez-O'Sullivan's NPI number?
- Ana Lopez-O'Sullivan's National Provider Identifier (NPI) is 1235363193, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ana Lopez-O'Sullivan's specialty?
- Ana Lopez-O'Sullivan is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ana Lopez-O'Sullivan located?
- Ana Lopez-O'Sullivan's practice location on file with NPPES is 3105 Lomita Blvd, Torrance, CA 90505-5108.
- What is Ana Lopez-O'Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Ana Lopez-O'Sullivan is (310) 784-4997.
- Does Ana Lopez-O'Sullivan accept Medicare?
- Ana Lopez-O'Sullivan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ana Lopez-O'Sullivan's NPI active?
- Yes — Ana Lopez-O'Sullivan's NPI (1235363193) is active in the NPPES registry as of the last update on 2014-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.