Timothy Yen, M.D.
NPI 1871988907 · Gastroenterology Physician · Loma Linda, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Yen, M.D. is a Gastroenterology Physician provider in Loma Linda, CA (NPI 1871988907).
Provider details
- NPI number
- 1871988907
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 143681 (CA)
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
11 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
393 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) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 55 | $235 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 51 | $123 |
| 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 | 47 | $16 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 46 | $131 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 33 | $105 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 74 | 27 |
| Famotidine | 69 | 22 |
| Linaclotidebrand: Linzess | 63 | 18 |
| Pantoprazole Sodium | 51 | 16 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 49 | 48 |
| Amitriptyline Hcl | 22 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 21 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$161 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
- 2015-04-06
- Last updated
- 2022-08-26
- Certified
- 2022-08-26
Frequently asked questions
- What is Timothy Yen's NPI number?
- Timothy Yen's National Provider Identifier (NPI) is 1871988907, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Yen's specialty?
- Timothy Yen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Yen located?
- Timothy Yen's practice location on file with NPPES is 11234 Anderson St # Mc-1516, Loma Linda, CA 92354-2804.
- What is Timothy Yen's phone number?
- The practice phone number listed in the NPPES registry for Timothy Yen is (909) 558-4905.
- Does Timothy Yen accept Medicare?
- Timothy Yen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Yen's NPI active?
- Yes — Timothy Yen's NPI (1871988907) is active in the NPPES registry as of the last update on 2022-08-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.