Billy Zhang, MD
NPI 1871087957 · Internal Medicine Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Billy Zhang, MD is a Internal Medicine Physician provider in Irvine, CA (NPI 1871087957).
Provider details
- NPI number
- 1871087957
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MT216737 (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
256 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 71 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $138 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 55 | $194 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 42 | $98 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 31 | $44 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 59 | 33 |
| Semaglutidebrand: Ozempic | 37 | — |
| Gabapentin | 36 | 12 |
| Rosuvastatin Calcium | 33 | 16 |
| Amlodipine Besylate | 28 | 15 |
| Levothyroxine Sodium | 28 | 12 |
| Semaglutide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$306 across 15 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 760 BroadwayBrooklyn, NY 11206-5317Phone: (718) 963-8000
Registry dates
- Enumerated
- 2018-06-21
- Last updated
- 2023-08-07
- Certified
- 2023-08-07
Frequently asked questions
- What is Billy Zhang's NPI number?
- Billy Zhang's National Provider Identifier (NPI) is 1871087957, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Billy Zhang's specialty?
- Billy Zhang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Billy Zhang located?
- Billy Zhang's practice location on file with NPPES is 13400 Jamboree Rd, Irvine, CA 92602-2308.
- What is Billy Zhang's phone number?
- The practice phone number listed in the NPPES registry for Billy Zhang is (714) 263-9279.
- Does Billy Zhang accept Medicare?
- Billy Zhang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Billy Zhang's NPI active?
- Yes — Billy Zhang's NPI (1871087957) is active in the NPPES registry as of the last update on 2023-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.