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

DR. HELEN CHING-YEI CHANG MD
NPI 1639134687
Internal Medicine in Mission Viejo, CA

Active since April 20, 2006PECOS Enrolled
25982 PALA, SUITE 250, MISSION VIEJO, CA 92691(949) 588-0051(949) 588-0052 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Helen Ching-yei Chang Md NPPES

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

DR. HELEN CHING-YEI CHANG MD (NPI 1639134687) is an individual internal medicine provider in Mission Viejo, California, licensed in California (A65088) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1639134687
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. HELEN CHING-YEI CHANGCredential: MD
Location Address25982 PALA, SUITE 250Mission Viejo, CA 92691-6719
Mailing Address25982 Pala, Suite 250Mission Viejo, CA 92691-6719 · (949) 588-0051 · Fax (949) 588-0052
Phone(949) 588-0051
Fax(949) 588-0052
Sole ProprietorNo
Enumeration DateApril 20, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1639134687 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A65088
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
25982 PALA, Mission Viejo, CA 92691
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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)

Dr. Helen Ching-yei Chang 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.

Areas of Expertise CMS Part B claims 5

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
51 services29 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.
32 services20 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
21 services21 patients
Annual depression screening, 5 to 15 minutes G0444
An annual depression screening is a short, routine evaluation to check for signs of depression. It involves answering a series of questions about your feelings, thoughts, and behaviors. The process takes about 15 minutes and helps detect depression early for better management.
17 services17 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92691 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 20

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

PETRA S PLACE PT
Physical Therapist
25982 PALA, SUITE 230
MISSION VIEJO, CA 92691
Orange County (949) 600-8812
DR. ROBERT CHARLES TARR O.D.
Optometrist
25982 PALA, STE 270
MISSION VIEJO, CA 92691
Orange County (949) 770-5514
SUELLEN M. SCARFF M.S., R.D.
Dietitian, Registered
25982 PALA, SUITE 140
MISSION VIEJO, CA 92691
Orange County (949) 770-0730
MISSION HILLS SURGICENTER, LLC
Clinic/Center (Ambulatory Surgical)
25982 PALA, SUITE#280
MISSION VIEJO, CA 92691
Orange County (949) 297-3838
MISSION HILLS MEDICAL GROUP, INC.
Internal Medicine
25982 PALA, SUITE 250
MISSION VIEJO, CA 92691
Orange County (949) 588-0051
CRUZ-HOPPE DENTAL CORPORATION
Dentist (General Practice)
25982 PALA, SUITE 210
MISSION VIEJO, CA 92691
Orange County (949) 458-2088
DR. MON-TA TSAI M.D.
Internal Medicine
25982 PALA, SUITE 250
MISSION VIEJO, CA 92691
Orange County (949) 588-0051
DR. TODD R. PLOCHER DDS
Dentist (General Practice)
25982 PALA, SUITE 200
MISSION VIEJO, CA 92691
Orange County (949) 472-5499

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Helen Chang's NPI number?

The NPI number for Helen Chang is 1639134687. It was assigned to this individual provider in the NPPES registry on April 20, 2006.

Where is Helen Chang located?

Helen Chang practices at 25982 Pala Suite 250, Mission Viejo, CA 92691. The listed phone number is (949) 588-0051.

What is Helen Chang's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Helen Chang enrolled in Medicare?

Yes. Helen Chang is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Helen Chang was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 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.