William Han, M.D.
NPI 1043300114 · Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Han, M.D. is a Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician provider in Fountain Valley, CA (NPI 1043300114).
Provider details
- NPI number
- 1043300114
- Entity type
- Individual
- Primary specialty
- Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A38218 (CA)
Specialties & taxonomies
- Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) PhysicianPrimary207VF0040XLicense A38218 (CA)
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxybutynin Chloride | 53 | 19 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 41 | 36 |
| Ciprofloxacin Hcl | 29 | 25 |
| Tolterodine Tartratebrand: Tolterodine Tartrate Er | 27 | 12 |
| Bethanechol Chloride | 26 | — |
| Estradiol | 22 | 14 |
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 (1)
- 11160 Warner Ave Ste 303Fountain Valley, CA 92708-4055Phone: (714) 444-3030
Registry dates
- Enumerated
- 2006-10-12
- Last updated
- 2022-07-21
Frequently asked questions
- What is William Han's NPI number?
- William Han's National Provider Identifier (NPI) is 1043300114, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Han's specialty?
- William Han is listed in the NPPES registry with a primary specialty of Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician (Allopathic & Osteopathic Physicians).
- Where is William Han located?
- William Han's practice location on file with NPPES is 17150 Euclid St Ste 220, Fountain Valley, CA 92708-4092.
- What is William Han's phone number?
- The practice phone number listed in the NPPES registry for William Han is (714) 444-3030.
- Does William Han accept Medicare?
- William Han is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Han's NPI active?
- Yes — William Han's NPI (1043300114) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.