DR. NANCY JEONG-SUN HAN M.D.
NPI 1609055300
Internal Medicine - Gastroenterology in Fountain Valley, CA

Q: What is Nancy Han's NPI number?

The NPI number for Nancy Han is 1609055300. It was assigned to this individual provider in the NPPES registry on October 30, 2007.

Q: What is Nancy Han'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 Nancy Han was last updated on February 3, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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 October 30, 2007PECOS EnrolledAccepts Medicare Assignment

18035 BROOKHURST ST STE 2100, FOUNTAIN VALLEY, CA 92708(657) 241-9090(714) 665-4603 Get Directions Write a Review

NPPES record last updated: February 3, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 3, 2023, Jan 12, 2023, Dec 16, 2022 and 3 more (6 updates tracked since 2020).

On this page

About Dr. Nancy Jeong-sun Han M.d. NPPES

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

DR. NANCY JEONG-SUN HAN M.D. (NPI 1609055300) is an individual gastroenterology provider in Fountain Valley, California, licensed in California (A99261) and active in the NPI registry since October 2007. She is enrolled in Medicare PECOS and is a graduate of Ohio Medical University (2005).

NPPES Registry Identity

NPI1609055300

Entity TypeIndividualFemale

Primary Taxonomy207RG0100X

Provider Legal NameDR. NANCY JEONG-SUN HANCredential: M.D.

Location Address18035 BROOKHURST ST STE 2100Fountain Valley, CA 92708-6738

Mailing Address18035 Brookhurst St Ste 2100Fountain Valley, CA 92708-6738 · (657) 241-9090 · Fax (714) 665-4603

Phone(657) 241-9090

Fax(714) 665-4603

Sole ProprietorNo

Medical School CMSOhio Medical UniversityGraduated 2005

Enumeration DateOctober 30, 2007

Last NPPES UpdateFebruary 3, 20236 updates tracked since enumeration

NPPES CertifiedJanuary 12, 2023

✔ NPI 1609055300 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 · A99261

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.

18035 BROOKHURST ST STE 2100, Fountain Valley, CA 92708

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nancy Jeong-sun Han M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6204982317

PECOS Enrollment IDI20110920000645

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.

Medicare Billing Reassignments

Medicare enrollment records show Nancy Han reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Memorialcare Medical Foundation

0.8 mi

Clinic/Center

17360 BROOKHURST ST
Fountain Valley, CA 92708

Reassigned Medicare billing, California enrollment
948 clinicians in this Medicare group

NPI 1205167350 (877) 696-3622

Healthcare Partners Affiliates Medical Group

7.5 mi

Addiction Medicine

14591 NEWPORT AVE
Tustin, CA 92780

Reassigned Medicare billing, California enrollment
2,052 clinicians in this Medicare group

NPI 1891981502 (714) 442-4864

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

64 services62 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

53 services40 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

42 services42 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

31 services28 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

28 services28 patients

Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito G0500

Moderate sedation is a method where a physician uses medication to help you relax during a gastrointestinal endoscopy. An independent trained observer will be present to monitor your vital signs and ensure your safety throughout the procedure. It's a common and safe practice.

24 services23 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92708 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

$142.39 typical visit price

range $62.96 – $187.60

Typical copayment $35.59 (range $15.74 – $46.90)

Most-billed visit code 99204

Established Patient

$109.96 typical visit price

range $20.84 – $153.61

Typical copayment $27.49 (range $5.21 – $38.40)

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.

Other Providers at the Same Location NPPES 10

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

DR. ERICK ARGUETA MD

Internal Medicine (Gastroenterology)