Byung-Chyul Hyun, MD
NPI 1558432534 · Family Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Byung-Chyul Hyun, MD is a Family Medicine Physician provider in Fontana, CA (NPI 1558432534).
Provider details
- NPI number
- 1558432534
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A80040 (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 · 113 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 702 | 428 |
| Amlodipine Besylate | 336 | 202 |
| Levothyroxine Sodium | 263 | 164 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 235 | 116 |
| Lisinopril | 220 | 144 |
| Losartan Potassium | 213 | 148 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2021-11-29
Frequently asked questions
- What is Byung-Chyul Hyun's NPI number?
- Byung-Chyul Hyun's National Provider Identifier (NPI) is 1558432534, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Byung-Chyul Hyun's specialty?
- Byung-Chyul Hyun is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Byung-Chyul Hyun located?
- Byung-Chyul Hyun's practice location on file with NPPES is 9961 Sierra Ave, Fontana, CA 92335-6720.
- What is Byung-Chyul Hyun's phone number?
- The practice phone number listed in the NPPES registry for Byung-Chyul Hyun is (909) 427-3910.
- Does Byung-Chyul Hyun accept Medicare?
- Byung-Chyul Hyun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Byung-Chyul Hyun's NPI active?
- Yes — Byung-Chyul Hyun's NPI (1558432534) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.