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DR. AJAY NAIR MD
NPI 1386174738
Psychiatry & Neurology - Psychiatry in Saint Louis, MO

Active since June 18, 2017PECOS EnrolledAccepts Medicare Assignment
10018 KENNERLY RD, SAINT LOUIS, MO 63128(314) 251-6663(314) 251-8716 Get Directions Write a Review

NPPES record last updated: July 23, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 23, 2026, Jun 18, 2017 (2 updates tracked since 2017).

About Dr. Ajay Nair Md NPPES

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

DR. AJAY NAIR MD (NPI 1386174738) is an individual psychiatry provider in Saint Louis, Missouri, licensed in Missouri (2020020186) and active in the NPI registry since June 2017. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital South, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1386174738
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. AJAY NAIRCredential: MD
Location Address10018 KENNERLY RDSaint Louis, MO 63128-2106
Mailing Address10018 Kennerly RdSaint Louis, MO 63128-2106 · (314) 251-6663 · Fax (314) 251-8716
Phone(314) 251-6663
Fax(314) 251-8716
Sole ProprietorNo
Medical School CMSOtherGraduated 2017
Enumeration DateJune 18, 2017
Last NPPES UpdateJuly 23, 20262 updates tracked since enumeration
NPPES CertifiedJuly 23, 2026
✔ NPI 1386174738 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 MO · 2020020186✔ Licensed in NY · 312605
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.
10018 KENNERLY RD, Saint Louis, MO 63128
Open in Google Maps ↗

Secondary Practice Locations 2

Location 11400 US Highway 61Crystal Cty, MO 63028-4108 · Phone (636) 933-1208 · Fax (636) 933-1837
Location 2615 S New Ballas RdSaint Louis, MO 63141-8221 · Phone (314) 251-6766 · Fax (314) 251-4237

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, UnitedHealthcare.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. Ajay Nair 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 ID9931474699
PECOS Enrollment IDI20260728001543
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 Ajay Nair reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

St Anthonys Physician Organization Hospitalist Services, L.C.
0.2 mi
Hospitalist
10010 KENNERLY RD, 3 SOUTHBRIDGE
Saint Louis, MO 63128
  • Reassigned Medicare billing, Missouri enrollment
  • Medicare enrollment name: St Anthonys Physician Organization Hospitalist Services Lc
  • 340 clinicians in this Medicare group
NPI 1407216336 (314) 525-1328
Mercy Clinic Adult Hospitalists - St. Louis, LLC
12 mi
Internal Medicine
621 S NEW BALLAS RD, SUITE 3016-B
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
  • 326 clinicians in this Medicare group
NPI 1841235108 (314) 251-6339
Mercy Clinic Adult Hospitalists- Jefferson, LLC
21 mi
Internal Medicine
1400 US HIGHWAY 61
Festus, MO 63028
  • Reassigned Medicare billing, Missouri enrollment
  • 299 clinicians in this Medicare group
NPI 1083052492 (314) 364-4200

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

Hospital Affiliations CMS Care Compare 2

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

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

Bellevue Hospital Center

Acute Care Hospitals · New York, NY
2/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number330204
Location462 First AvenueNew York, NY 10016 · New York County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63128 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
$169.38 typical visit price
range $55.65 – $169.38
Typical copayment $42.34 (range $13.91 – $42.34)
Most-billed visit code 99205
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
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.

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.

SREENU ADA,MD,PC
Internal Medicine
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (636) 465-0544
ROHIT PAWAR M.D.
Psychiatry & Neurology (Child & Adolescent Psychiatry)
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-7275
SREENU ADA MD
Internal Medicine
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-7275
MS. LAURIE A BRUNDICK LCSW
Social Worker (Clinical)
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-4412
DR. HADI FAHEEM SIDDIQUE MD
Psychiatry & Neurology (Psychiatry)
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 251-6663
MOHAMED ELGARABLY
Nurse Practitioner (Psychiatric/Mental Health)
10018 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-3421
KINDRED HOSPITALS EAST, LLC
Long Term Care Hospital
10018 KENNERLY RD, 3RD FLOOR, HYLAND BLDG. B
SAINT LOUIS, MO 63128
St. Louis County (314) 525-8100
KND DEVELOPMENT 59, LLC
Hospitalist
10018 KENNERLY RD, 3RD FLOOR, HYLAND BUILDING B, ST.
SAINT LOUIS, MO 63128
St. Louis County (314) 525-8100

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 Ajay Nair's NPI number?

The NPI number for Ajay Nair is 1386174738. It was assigned to this individual provider in the NPPES registry on June 18, 2017.

Where is Ajay Nair located?

Ajay Nair practices at 10018 Kennerly Rd, Saint Louis, MO 63128. The listed phone number is (314) 251-6663.

What is Ajay Nair's specialty?

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

Is Ajay Nair enrolled in Medicare?

Yes. Ajay Nair 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 Ajay Nair's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ajay Nair reassigns Medicare benefits to 3 organizations: St Anthonys Physician Organization Hospitalist Services, L.C. (Saint Louis, MO), Mercy Clinic Adult Hospitalists - St. Louis, LLC (Saint Louis, MO) and Mercy Clinic Adult Hospitalists- Jefferson, LLC (Festus, MO). 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 Ajay Nair's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ajay Nair accept?

Health plans from Anthem Blue Cross and Blue Shield and UnitedHealthcare list Ajay Nair 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 Ajay Nair affiliated with any hospitals?

According to CMS data, Ajay Nair is affiliated with Mercy Hospital South and Bellevue Hospital Center.

When was this NPI record last updated?

The NPPES record for Ajay Nair was last updated on July 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.