Jonathan Chien, M.D.
NPI 1558327270 · Internal Medicine Physician · Montebello, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Chien, M.D. is a Internal Medicine Physician provider in Montebello, CA (NPI 1558327270).
Provider details
- NPI number
- 1558327270
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A50095 (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
20 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
51 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 37 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 14 | $88 |
Typical Medicare-allowed amounts for these services range $88–$132 (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 · 103 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 522 | 169 |
| Amlodipine Besylate | 355 | 103 |
| Metformin Hcl | 284 | 91 |
| Lisinopril | 281 | 90 |
| Tamsulosin Hcl | 254 | 75 |
| Simvastatin | 253 | 73 |
| Losartan Potassium | 216 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-21
- Last updated
- 2025-12-08
- Certified
- 2025-12-08
Frequently asked questions
- What is Jonathan Chien's NPI number?
- Jonathan Chien's National Provider Identifier (NPI) is 1558327270, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Chien's specialty?
- Jonathan Chien is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Chien located?
- Jonathan Chien's practice location on file with NPPES is 2603 Via Campo, Montebello, CA 90640-1807.
- What is Jonathan Chien's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Chien is (323) 720-1144.
- Does Jonathan Chien accept Medicare?
- Jonathan Chien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Chien's NPI active?
- Yes — Jonathan Chien's NPI (1558327270) is active in the NPPES registry as of the last update on 2025-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.