Crystal Irwin Warren, D.O.
NPI 1235585639 · Emergency Medicine Physician · Fresno, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Crystal Irwin Warren, D.O. is a Emergency Medicine Physician provider in Fresno, CA (NPI 1235585639).
Provider details
- NPI number
- 1235585639
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 20A15353 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Amlodipine Besylate | 21 |
| Sertraline Hcl | 18 |
| Rosuvastatin Calcium | 16 |
| Lisinopril | 13 |
| Benazepril Hcl | 12 |
| Gabapentin | 12 |
| Omeprazole | 12 |
| Levothyroxine Sodium | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 2051 Marengo StLos Angeles, CA 90033-1352Phone: (323) 409-1000
- 2051 Marengo StLos Angeles, CA 90033-1352Phone: (323) 409-1000
Registry dates
- Enumerated
- 2016-05-04
- Last updated
- 2022-09-09
- Certified
- 2022-09-09
Frequently asked questions
- What is Crystal Irwin Warren's NPI number?
- Crystal Irwin Warren's National Provider Identifier (NPI) is 1235585639, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Crystal Irwin Warren's specialty?
- Crystal Irwin Warren is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Crystal Irwin Warren located?
- Crystal Irwin Warren's practice location on file with NPPES is 1303 E Herndon Ave, Fresno, CA 93720.
- What is Crystal Irwin Warren's phone number?
- The practice phone number listed in the NPPES registry for Crystal Irwin Warren is (559) 450-3000.
- Does Crystal Irwin Warren accept Medicare?
- Crystal Irwin Warren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Crystal Irwin Warren's NPI active?
- Yes — Crystal Irwin Warren's NPI (1235585639) is active in the NPPES registry as of the last update on 2022-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.