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DR. JUSTIN HUYNH M.D.
NPI 1902096613
Internal Medicine in Saint Louis, MO

Active since July 29, 2007PECOS EnrolledAccepts Medicare Assignment
4460 S LINDBERGH BLVD, SAINT LOUIS, MO 63127(314) 843-7557(314) 849-8671 Get Directions Write a Review

NPPES record last updated: March 31, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 31, 2026, Jan 10, 2022, Mar 28, 2018 (3 updates tracked since 2018).

About Dr. Justin Huynh M.d. NPPES

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

DR. JUSTIN HUYNH M.D. (NPI 1902096613) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2009029861) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and maintains 7 additional practice locations.

NPPES Registry Identity

NPI1902096613
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. JUSTIN HUYNHCredential: M.D.
Location Address4460 S LINDBERGH BLVDSaint Louis, MO 63127-1647
Mailing Address4460 S Lindbergh BlvdSaint Louis, MO 63127-1647 · (314) 843-7557 · Fax (314) 849-8671
Phone(314) 843-7557
Fax(314) 849-8671
Sole ProprietorYes
Medical School CMSIndiana University School Of MedicineGraduated 2007
Enumeration DateJuly 29, 2007
Last NPPES UpdateMarch 31, 20263 updates tracked since enumeration
NPPES CertifiedMarch 31, 2026
✔ NPI 1902096613 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · 2009029861
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.
4460 S LINDBERGH BLVD, Saint Louis, MO 63127
Open in Google Maps ↗

Secondary Practice Locations 7

Location 116659 E 23rd St SIndependence, MO 64055-1922 · Phone (816) 688-6000 · Fax (816) 631-1885
Location 23451 Union BlvdSaint Louis, MO 63115-1142 · Phone (314) 888-0970 · Fax (314) 408-7063
Location 315740 S Outer 40 RdChesterfield, MO 63017-2004 · Phone (636) 735-4205
Location 44460 S Lindbergh BlvdSaint Louis, MO 63127-1647 · Phone (314) 843-7557 · Fax (314) 849-8671
Location 53863A Gravois AveSaint Louis, MO 63116-4657 · Phone (314) 888-0981 · Fax (314) 442-7794
Location 68033 W Florissant Ave Ste AJennings, MO 63136-1412 · Phone (314) 888-0971 · Fax (314) 408-7062
Location 710024 Watson RdSaint Louis, MO 63126-1829 · Phone (314) 919-2500

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.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. Justin Huynh 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 ID4183758089
PECOS Enrollment IDI20100813000758
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

3

Medicare enrollment records show Justin Huynh reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Clinic East Communities
1.8 mi
Family Medicine
10004 KENNERLY RD STE 395B
Saint Louis, MO 63128
  • Reassigned Medicare billing, Missouri enrollment
  • 744 clinicians in this Medicare group
NPI 1720635329 (314) 849-3500
Mercy Aco Clinical Services Inc
13 mi
Neurology
15740 S OUTER 40 RD
Chesterfield, MO 63017
  • Reassigned Medicare billing, Missouri enrollment
  • 263 clinicians in this Medicare group
NPI 1063965093 (636) 237-4200
Mercy Health Northwest Arkansas Communities
254 mi
Multi-Specialty
1 MERCY WAY
Bella Vista, AR 72714
  • Reassigned Medicare billing, Arkansas enrollment
  • 472 clinicians in this Medicare group
NPI 1396173514 (479) 802-5555

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 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 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.
155 services95 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.
20 services20 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
18 services18 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.
18 services16 patients
Hemoglobin a1c level 83036
Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.
14 services11 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Hospital St Louis

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260020
Location615 New Ballas RoadSaint Louis, MO 63141 · St. Louis County
Emergency services Birthing friendly

Mercy Hospital South

Acute Care Hospitals · Saint Louis, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260077
Location10010 Kennerly RoadSaint Louis, MO 63128 · St. Louis County
Emergency services

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63127 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
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 5

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

DR. KENNETH ALSTON LEE DO
Family Medicine
4460 S LINDBERGH BLVD
SAINT LOUIS, MO 63127
St. Louis County (573) 359-4485
MEGAN FALLER
Physician Assistant
4460 S LINDBERGH BLVD
SAINT LOUIS, MO 63127
St. Louis County (314) 843-7557
MRS. ANNE MARIE BANNISTER AGNP
Nurse Practitioner (Adult Health)
4460 S LINDBERGH BLVD
SAINT LOUIS, MO 63127
St. Louis County (314) 843-7557
MR. KEMDI EGEKEZE MD
Family Medicine
4460 S LINDBERGH BLVD
SAINT LOUIS, MO 63127
St. Louis County (314) 843-7557
LYDIA N. GREFFET PA-C
Physician Assistant
4460 S LINDBERGH BLVD
SAINT LOUIS, MO 63127
St. Louis County (314) 843-7557

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 Justin Huynh's NPI number?

The NPI number for Justin Huynh is 1902096613. It was assigned to this individual provider in the NPPES registry on July 29, 2007.

Where is Justin Huynh located?

Justin Huynh practices at 4460 S Lindbergh Blvd, Saint Louis, MO 63127. The listed phone number is (314) 843-7557.

What is Justin Huynh's specialty?

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

Is Justin Huynh enrolled in Medicare?

Yes. Justin Huynh 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 Justin Huynh's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Justin Huynh reassigns Medicare benefits to 3 organizations: Mercy Clinic East Communities (Saint Louis, MO), Mercy Aco Clinical Services Inc (Chesterfield, MO) and Mercy Health Northwest Arkansas Communities (Bella Vista, AR). 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 Justin Huynh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Justin Huynh accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list Justin Huynh 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.

Is Justin Huynh affiliated with any hospitals?

According to CMS data, Justin Huynh is affiliated with Mercy Hospital St Louis, Mercy Hospital South and Missouri Baptist Medical Center.

When was this NPI record last updated?

The NPPES record for Justin Huynh was last updated on March 31, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.