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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.

ARIANA JUNE KOSTER MD
NPI 1306333521
Psychiatry & Neurology - Psychiatry in Elmwood, LA

Active since April 13, 2018PECOS Enrolled
5105 CITRUS BLVD APT 205, ELMWOOD, LA 70123(617) 429-5527 Get Directions Write a Review

NPPES record last updated: October 5, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 5, 2026, Sep 30, 2026, Sep 25, 2026 and 2 more (5 updates tracked since 2018).

About Ariana June Koster Md NPPES

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

ARIANA JUNE KOSTER MD (NPI 1306333521) is an individual psychiatry provider in Elmwood, Louisiana, licensed in California (207400) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS and is a graduate of Other (2018).

NPPES Registry Identity

NPI1306333521
Entity TypeIndividualFemale
Primary Taxonomy2084P0800X
Provider Legal NameARIANA JUNE KOSTERCredential: MD
Location Address5105 CITRUS BLVD APT 205Elmwood, LA 70123-7153
Mailing Address5105 Citrus Blvd Apt 205Elmwood, LA 70123-7153 · (617) 429-5527
Phone(617) 429-5527
Sole ProprietorNo
Medical School CMSOtherGraduated 2018
Enumeration DateApril 13, 2018
Last NPPES UpdateOctober 5, 20265 updates tracked since enumeration
NPPES CertifiedOctober 5, 2026
✔ NPI 1306333521 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
Licenses✔ Licensed in CA · 207400✔ Licensed in NY · 344689✔ Licensed in LA · 329071
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
5105 CITRUS BLVD APT 205, Elmwood, LA 70123
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ariana June Koster Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID8729544333
PECOS Enrollment IDI20260803002133
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 Reassignment

Medicare enrollment records show Ariana Koster reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mellow Medical Inc A Professional Corporation
1,673 mi
Psychiatry
8235 SANTA MONICA BLVD, SUITE 300
West Hollywood, CA 90046
  • Reassigned Medicare billing, California enrollment
  • 204 clinicians in this Medicare group
NPI 1407275886 (310) 892-4284

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 70123 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
$170.30 typical visit price
range $55.50 – $170.30
Typical copayment $42.57 (range $13.87 – $42.57)
Most-billed visit code 99205
Established Patient
$69.44 typical visit price
range $17.42 – $138.03
Typical copayment $17.36 (range $4.35 – $34.50)
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.

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 Ariana Koster's NPI number?

The NPI number for Ariana Koster is 1306333521. It was assigned to this individual provider in the NPPES registry on April 13, 2018.

Where is Ariana Koster located?

Ariana Koster practices at 5105 Citrus Blvd Apt 205, Elmwood, LA 70123. The listed phone number is (617) 429-5527.

What is Ariana Koster's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Ariana Koster enrolled in Medicare?

Yes. Ariana Koster is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ariana Koster's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ariana Koster reassigns Medicare benefits to Mellow Medical Inc A Professional Corporation (West Hollywood, CA). The 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 Ariana Koster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ariana Koster was last updated on October 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 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.