Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JENNIFER YOON MD
NPI 1851850903
Internal Medicine - Gastroenterology in Rancho Cucamonga, CA

Q: What is Jennifer Yoon's NPI number?

The NPI number for Jennifer Yoon is 1851850903. It was assigned to this individual provider in the NPPES registry on March 18, 2019.

Q: What is Jennifer Yoon's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Jennifer Yoon was last updated on September 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 18, 2019PECOS Enrolled

85/100

CMS Quality Rating

9481 PITTSBURGH AVE STE 200, RANCHO CUCAMONGA, CA 91730(909) 655-0300(909) 655-1161 Get Directions Write a Review

NPPES record last updated: September 23, 2026. Verified against the NPPES registry weekly; last sync: September 27, 2026.

Record update history: Sep 23, 2026, Sep 6, 2022, Mar 18, 2019 (3 updates tracked since 2019).

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About Jennifer Yoon Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JENNIFER YOON MD (NPI 1851850903) is an individual gastroenterology provider in Rancho Cucamonga, California, licensed in California (A177786) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1851850903

Entity TypeIndividualFemale

Primary Taxonomy207RG0100X

Provider Legal NameJENNIFER YOONCredential: MD

Location Address9481 PITTSBURGH AVE STE 200Rancho Cucamonga, CA 91730-9021

Mailing Address9481 Pittsburgh Ave Ste 200Rancho Cucamonga, CA 91730-9021 · (909) 655-0300 · Fax (909) 655-1161

Phone(909) 655-0300

Fax(909) 655-1161

Sole ProprietorNo

Enumeration DateMarch 18, 2019

Last NPPES UpdateSeptember 23, 20263 updates tracked since enumeration

NPPES CertifiedSeptember 23, 2026

✔ NPI 1851850903 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in CA · A177786

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

9481 PITTSBURGH AVE STE 200, Rancho Cucamonga, CA 91730

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Jennifer Yoon Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91730 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$136.04 typical visit price

range $59.60 – $179.42

Typical copayment $34.01 (range $14.90 – $44.85)

Most-billed visit code 99204

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

85/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

81.33

Promoting Interoperability

100

Improvement Activities

Cost

45.02

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NICOLAS ALLEN KNOWLES PA-C

Physician Assistant (Medical)