DR. TIEN QUANG NGUYEN MD
NPI 1396741351
Dermatology in Fountain Valley, CA

Q: What is Tien Nguyen's NPI number?

The NPI number for Tien Nguyen is 1396741351. It was assigned to this individual provider in the NPPES registry on June 24, 2005.

Q: What is Tien Nguyen's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Q: When was this NPI record last updated?

The NPPES record for Tien Nguyen was last updated on April 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months 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 June 24, 2005PECOS EnrolledAccepts Medicare AssignmentCLIA 05D2078033 · Certificate of Compliance

75/100

CMS Quality Rating

17271 BROOKHURST ST, FOUNTAIN VALLEY, CA 92708(714) 531-2966(714) 531-3495 Get Directions Write a Review

NPPES record last updated: April 1, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Dr. Tien Quang Nguyen Md NPPES

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

DR. TIEN QUANG NGUYEN MD (NPI 1396741351) is an individual dermatology provider in Fountain Valley, California, licensed in California (G50454) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, holds a CLIA Certificate of Compliance certificate valid through December 4, 2026, and is a graduate of University Of Florida College Of Medicine (1982).

NPPES Registry Identity

NPI1396741351

Entity TypeIndividualMale

Primary Taxonomy207N00000X

Provider Legal NameDR. TIEN QUANG NGUYENCredential: MD

Location Address17271 BROOKHURST STFountain Valley, CA 92708-3701

Mailing Address17271 Brookhurst StFountain Valley, CA 92708-3701 · (714) 531-2966 · Fax (714) 531-3495

Phone(714) 531-2966

Fax(714) 531-3495

Sole ProprietorYes

Medical School CMSUniversity Of Florida College Of MedicineGraduated 1982

Enumeration DateJune 24, 2005

Last NPPES UpdateApril 1, 2025

NPPES CertifiedApril 1, 2025

✔ NPI 1396741351 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians

Taxonomy Code207N00000X

Licenses✔ Licensed in CA · G50454✔ Licensed in NV · 20979

Definition

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

17271 BROOKHURST ST, Fountain Valley, CA 92708

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Molina Healthcare.Insurance ›

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. Tien Quang Nguyen Md 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 ID1850395344

PECOS Enrollment IDI20060914000663, I20250217002432

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 Tien Nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

First Oc Dermatology PC

Same address

Dermatology

17271 BROOKHURST ST
Fountain Valley, CA 92708

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Tien Q Nguyen Inc
6 clinicians in this Medicare group

NPI 1710124417 (714) 531-2966

Tien Q Nguyen MD Dermatology Prof Corp

225 mi

Dermatology

3037 W HORIZON RIDGE PKWY STE 120
Henderson, NV 89052

Reassigned Medicare billing, Nevada enrollment

NPI 1477364818 (725) 999-4405

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 05D2078033

Tien Q Nguyen MD · Fountain Valley, CA

Active · expires Dec 4, 2026

CLIA Number05D2078033

Laboratory TypePhysician Office

Certificate Effective DateDecember 5, 2024

Certificate Expiration DateDecember 4, 2026

Laboratory DirectorTien Q. Nguyen MD

Laboratory Phone(714) 531-2966

Laboratory LocationTien Q Nguyen MD17271 Brookhurst St, Fountain Valley, CA 92708

CLIA data matches this NPI record on: Address Phone

This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Areas of Expertise CMS Part B claims 27

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 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.

2,569 services1,100 patients

Destruction of precancer skin growth, 2-14 growths 17003

This procedure involves removing 2-14 precancerous skin growths. The growths are treated to prevent them from potentially developing into skin cancer. The process is safe, with minimal discomfort, and promotes healthier skin.

1,735 services201 patients

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.

1,393 services706 patients

Destruction of skin growth, 1-14 growths 17110

"Destruction of skin growth" refers to a procedure where 1-14 abnormal skin growths are removed. This is done using methods such as freezing, burning, or laser therapy. It helps prevent the growth from causing discomfort or turning into a more serious condition.

981 services528 patients

Destruction of skin growth, 15 or more growths 17111

"Destruction of skin growth" refers to a procedure where unwanted skin growths, such as warts or moles, are removed. In this case, 15 or more growths are treated. Techniques may include freezing, burning, or laser therapy. It's a safe, quick process to improve skin health.

624 services267 patients

Destruction of precancer skin growth, 1 growth 17000

"Destruction of precancer skin growth" is a procedure that eliminates a single precancerous skin growth. This is done to prevent it from developing into skin cancer. The growth may be removed using various methods such as cryotherapy (freezing), laser therapy, or topical medications.

493 services264 patients

Test for allergy using skin patch 95044

A skin patch test helps identify allergens causing skin reactions. Small patches with potential allergens are applied to your skin, usually on the back. After 48 hours, they are removed to check for reactions. It's a safe and effective way to diagnose allergies.

396 services11 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.

351 services351 patients

Destruction of precancer skin growth, 15 or more growths 17004

This procedure involves removing 15 or more precancerous skin growths to prevent them from developing into cancer. It's done using various methods like freezing, creams, or minor surgery. The goal is to protect your health by stopping cancer before it starts.

205 services117 patients

Biopsy of related skin growth, first growth 11102

A biopsy of a skin growth involves taking a small sample of the growth to examine it under a microscope. This helps determine if the growth is harmful. The procedure is typically quick, with minimal discomfort. It's a crucial step in ensuring your skin's health.

201 services185 patients

Treatment of inflammatory skin disease using laser, less than 250.0 sq cm 96920

This treatment involves using laser technology to target and reduce inflammation in skin diseases. It's suitable for treating areas less than 250.0 sq cm. The laser light helps to minimize inflammation, promoting healing in the affected area.

157 services30 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

138 services138 patients

Biopsy of related skin growth, each additional growth 11103

A biopsy of related skin growth is a procedure where a small piece of skin growth is removed for testing. If additional growths are identified, they may also be biopsied. This helps in diagnosing skin conditions and planning appropriate treatment.

135 services81 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

124 services54 patients

Injection into skin growth, 1-7 growths 11900

This procedure involves injecting medication into 1-7 skin growths. The medication helps to reduce the size of the growths or completely eliminate them. It's a simple, quick, and usually painless process performed by a medical professional.

120 services41 patients

Incision biopsy, first skin growth 11106

An incision biopsy involves taking a small sample of a skin growth for further examination. A local anesthetic is used to numb the area, then a portion of the growth is removed using a surgical knife. This helps identify the nature of the growth.

66 services58 patients

Incision biopsy, each additional skin growth 11107

An incision biopsy involves taking a small sample of a skin growth for examination. If there are multiple growths, each additional biopsy requires a separate procedure. This helps to identify the nature of the growths and guide appropriate treatment.

40 services36 patients

Therapy procedure using ultraviolet radiation with tar or petroleum jelly application 96910

This therapy involves applying tar or petroleum jelly on the skin, followed by exposure to ultraviolet radiation. It helps in treating skin conditions by slowing cell growth and reducing inflammation. It's a safe, controlled process, often used for conditions like psoriasis.

31 services11 patients

Complicated repair of wound of trunk, 2.6-7.5 cm 13101

This service involves the intricate repair of a wound on your body's main structure, between your neck and limbs. The wound measures 2.6-7.5 cm. The procedure includes deep-layer stitching and may involve repairing damaged tissue.

23 services20 patients

Removal of noncancer skin growth of body, arms, or legs, 2.1-3.0 cm 11403

This is a procedure where a noncancerous skin growth, sized 2.1-3.0 cm, on the body, arms, or legs is removed. It's typically done under local anesthesia. The process involves cutting out the growth and stitching the skin back together. The aim is to eliminate discomfort and prevent potential health issues.

20 services19 patients

Simple or single drainage of skin abscess 10060

A simple or single drainage of skin abscess is a procedure to remove pus from a skin infection. A small cut is made on the abscess, the pus is drained out, and the area is cleaned. This helps to reduce pain, speed up recovery, and prevent the spread of infection.

18 services17 patients

Removal of noncancer skin growth of face, ears, eyelids, nose, lips, or mouth, 1.1-2.0 cm 11442

This procedure involves the removal of a noncancerous skin growth on your face, ears, eyelids, nose, lips, or mouth that measures between 1.1-2.0 cm. It's a safe process to enhance your comfort and appearance.

17 services16 patients

Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks 17311

This procedure involves the careful removal of a growth from the head, neck, hands, or feet. The removed tissue, divided into 1-5 blocks, is then examined under a microscope to study its characteristics and determine the nature of the growth.

17 services15 patients

Complicated repair of wound of scalp, arms, or legs, 2.6-7.5 cm 13121

This is a procedure to repair a complex wound on your scalp, arm, or leg that is 2.6-7.5 cm long. It involves cleaning, removing damaged tissue, and stitching the wound to promote healing. It's performed under local or general anesthesia.

15 services15 patients

Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.5 cm or less 12031

This procedure involves the repair of a wound that is located on the scalp, underarms, trunk, arms, or legs and is 2.5 cm or less in size. The repair is intermediate, meaning it's more complex than a simple closure, but not as extensive as a complex repair.

12 services12 patients

Intermediate repair of wound of face, ears, eyelids, nose, lips, or mouth, 2.5 cm or less 12051

This procedure involves repairing a wound on your face, ears, eyelids, nose, lips, or mouth. The wound is 2.5 cm or less in size. The repair process includes cleaning, treating, and stitching the wound to promote optimal healing. It's a standard, safe procedure.

12 services11 patients

Complicated repair of wound of forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet, 2.6-7.5 cm 13132

This procedure involves the complex repair of a wound in areas like the forehead, cheeks, chin, mouth, neck, underarms, hands, or feet. The wound size ranges from 2.6-7.5 cm. The process includes cleaning, removing damaged tissue, and stitching the wound for proper healing.

11 services11 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

$96.36 typical visit price

range $62.96 – $187.60

Typical copayment $24.09 (range $15.74 – $46.90)

Most-billed visit code 99203

Established Patient

$77.96 typical visit price

range $20.84 – $153.61

Typical copayment $19.49 (range $5.21 – $38.40)

Most-billed visit code 99213

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.

75/100

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

Scored as part of a group practice

Reported Quality Measures

e-Prescribing

100%1,666 patients5/55-star benchmark: 100%

Provide Patients Electronic Access to Their Health Information

98%5,579 patients4/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 8

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

JASMINE IRIS LI PA-C

Physician Assistant (Medical)

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (972) 854-8765

JOANNE R MEJIA FNP-C

Nurse Practitioner (Family)

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-0966

MELANIE GLENN ANDERSON PA-C

Physician Assistant

17271 BROOKHURST ST, SUITE A
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

MS. GRACE HARUMI NAKAMURA PA

Physician Assistant

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

KELLIE HOY

Physician Assistant

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

ISABEL NGUYEN PA-C

Physician Assistant

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

FIRST OC DERMATOLOGY PC

Dermatology

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

STEPHANIE ASHQAR PA

Physician Assistant

17271 BROOKHURST ST
FOUNTAIN VALLEY, CA 92708

Orange County (714) 531-2966

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 Tien Nguyen's NPI number?

The NPI number for Tien Nguyen is 1396741351. It was assigned to this individual provider in the NPPES registry on June 24, 2005.

Where is Tien Nguyen located?

Tien Nguyen practices at 17271 Brookhurst St, Fountain Valley, CA 92708. The listed phone number is (714) 531-2966.

What is Tien Nguyen's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Tien Nguyen enrolled in Medicare?

Yes. Tien Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Tien Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tien Nguyen reassigns Medicare benefits to 2 organizations: First Oc Dermatology PC (Fountain Valley, CA) and Tien Q Nguyen MD Dermatology Prof Corp (Henderson, NV). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Tien Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Does Tien Nguyen hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 05D2078033) is associated with this NPI, valid through December 4, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Tien Nguyen accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health and Molina Healthcare list Tien Nguyen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Tien Nguyen was last updated on April 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months 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.

About Dr. Tien Quang Nguyen Md NPPES

NPPES Registry Identity

Specialties & Licenses

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare Enrollment Status

Medicare Billing Reassignments

CLIA Laboratory Certificates CMS CLIA

Certificate of Compliance · 05D2078033

Areas of Expertise CMS Part B claims 27

Physician Visit Costs CMS claims · ZIP area

Medicare Quality Performance CMS QPP · MIPS

Reported Quality Measures

Other Providers at the Same Location NPPES 8

Frequently Asked Questions NPPES & CMS

What is Tien Nguyen's NPI number?

Where is Tien Nguyen located?

What is Tien Nguyen's specialty?

Is Tien Nguyen enrolled in Medicare?

Which organizations bill Medicare for Tien Nguyen's services?

Does Tien Nguyen hold a CLIA laboratory certificate?

What insurance does Tien Nguyen accept?

When was this NPI record last updated?

Certificate of Compliance 05D2078033