Fen Jiang, MD
NPI 1831312289 · Medical Oncology Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Fen Jiang, MD is a Medical Oncology Physician provider in Mission Viejo, CA (NPI 1831312289).
Provider details
- NPI number
- 1831312289
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD60176134 (WA)
Specialties & taxonomies
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
19 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
1,729 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 519 | $192 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 379 | $7 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 257 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 179 | $139 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 177 | $10 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 161 | 64 |
| Dexamethasone | 56 | 21 |
| Ondansetron Hcl | 45 | 25 |
| Pantoprazole Sodium | 43 | 15 |
| Prochlorperazine Maleate | 42 | 31 |
| Tamoxifen Citrate | 40 | 14 |
| Apixabanbrand: Eliquis | 37 | 13 |
| Letrozole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,237 across 135 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
Registry dates
- Enumerated
- 2007-04-11
- Last updated
- 2022-08-19
- Certified
- 2022-08-19
Frequently asked questions
- What is Fen Jiang's NPI number?
- Fen Jiang's National Provider Identifier (NPI) is 1831312289, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Fen Jiang's specialty?
- Fen Jiang is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Fen Jiang located?
- Fen Jiang's practice location on file with NPPES is 27799 Medical Center Rd Ste 460, Mission Viejo, CA 92691-6400.
- What is Fen Jiang's phone number?
- The practice phone number listed in the NPPES registry for Fen Jiang is (949) 347-0600.
- Does Fen Jiang accept Medicare?
- Fen Jiang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Fen Jiang's NPI active?
- Yes — Fen Jiang's NPI (1831312289) is active in the NPPES registry as of the last update on 2022-08-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.