Sin Ku, MD
NPI 1912074857 · Family Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sin Ku, MD is a Family Medicine Physician provider in Fontana, CA (NPI 1912074857).
Provider details
- NPI number
- 1912074857
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A64824 (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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 |
|---|---|---|
| Doxycycline Monohydrate | 54 | 52 |
| Cephalexin | 48 | 48 |
| Prednisone | 25 | 23 |
| Amoxicillin | 21 | 21 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 13 | 12 |
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 11 | 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
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2021-12-03
Frequently asked questions
- What is Sin Ku's NPI number?
- Sin Ku's National Provider Identifier (NPI) is 1912074857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sin Ku's specialty?
- Sin Ku is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sin Ku located?
- Sin Ku's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is Sin Ku's phone number?
- The practice phone number listed in the NPPES registry for Sin Ku is (909) 427-3910.
- Does Sin Ku accept Medicare?
- Sin Ku is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sin Ku's NPI active?
- Yes — Sin Ku's NPI (1912074857) is active in the NPPES registry as of the last update on 2021-12-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.