Wei-Fang Ko, M.D.
NPI 1417068081 · Gastroenterology Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Wei-Fang Ko, M.D. is a Gastroenterology Physician provider in Castro Valley, CA (NPI 1417068081).
Provider details
- NPI number
- 1417068081
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A62022 (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
19 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
892 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 231 | $109 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 121 | $89 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 113 | $135 |
| New Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 15 Minutes Or More99202 | 72 | $90 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 71 | $285 |
| Biopsy of Large Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 300 | 297 |
| Omeprazole | 68 | 27 |
| Pantoprazole Sodium | 44 | 14 |
| Tenofovir Alafenamidebrand: Vemlidy | 30 | — |
| Mesalamine | 19 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 16 | 16 |
| Tenofovir Disoproxil Fumarate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-31
- Last updated
- 2022-08-01
- Certified
- 2022-08-01
Frequently asked questions
- What is Wei-Fang Ko's NPI number?
- Wei-Fang Ko's National Provider Identifier (NPI) is 1417068081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Wei-Fang Ko's specialty?
- Wei-Fang Ko is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Wei-Fang Ko located?
- Wei-Fang Ko's practice location on file with NPPES is 19845 Lake Chabot Rd, Castro Valley, CA 94546-4055.
- What is Wei-Fang Ko's phone number?
- The practice phone number listed in the NPPES registry for Wei-Fang Ko is (510) 537-4415.
- Does Wei-Fang Ko accept Medicare?
- Wei-Fang Ko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Wei-Fang Ko's NPI active?
- Yes — Wei-Fang Ko's NPI (1417068081) is active in the NPPES registry as of the last update on 2022-08-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.