Mark Zhang, MD
NPI 1831620913 · Emergency Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Zhang, MD is a Emergency Medicine Physician provider in Los Angeles, CA (NPI 1831620913).
Provider details
- NPI number
- 1831620913
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A157709 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
855 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 377 | $8 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 310 | $174 |
| Critical Care, First 30-74 Minutes99291 | 111 | $214 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 57 | $120 |
Typical Medicare-allowed amounts for these services range $8–$214 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 45 | 44 |
| Ibuprofen | 41 | 41 |
| Cephalexin | 25 | 25 |
| Naproxen | 25 | 25 |
| Cefuroxime Axetilbrand: Cefuroxime | 24 | 23 |
| Ondansetron Hcl | 22 | 22 |
| Cyclobenzaprine Hcl | 21 | 21 |
| Doxycycline Monohydrate | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$141 across 1 record (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
Registry dates
- Enumerated
- 2017-03-21
- Last updated
- 2021-12-03
- Certified
- 2021-08-05
Frequently asked questions
- What is Mark Zhang's NPI number?
- Mark Zhang's National Provider Identifier (NPI) is 1831620913, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Zhang's specialty?
- Mark Zhang is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Zhang located?
- Mark Zhang's practice location on file with NPPES is 1225 Wilshire Blvd, Los Angeles, CA 90017-1901.
- What is Mark Zhang's phone number?
- The practice phone number listed in the NPPES registry for Mark Zhang is (213) 977-2121.
- Does Mark Zhang accept Medicare?
- Mark Zhang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Zhang's NPI active?
- Yes — Mark Zhang's NPI (1831620913) 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.