1. Home
  2. Directory
  3. California
  4. Encino
  5. Internal Medicine
  6. NPI Profile
Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

AIDA JERAIR SIYAHIAN MD
NPI 1891314563
Internal Medicine - Allergy & Immunology in Encino, CA

Active since April 13, 2020PECOS Enrolled
15503 VENTURA BLVD STE 170, ENCINO, CA 91436(818) 461-8148(818) 461-8105 Get Directions Write a Review

NPPES record last updated: October 1, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 1, 2026, Jun 26, 2024, Apr 13, 2020 (3 updates tracked since 2020).

About Aida Jerair Siyahian Md NPPES

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

AIDA JERAIR SIYAHIAN MD (NPI 1891314563) is an individual allergy & immunology provider in Encino, California, licensed in California (A185031) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS and maintains a secondary practice location in Los Angeles.

NPPES Registry Identity

NPI1891314563
Entity TypeIndividualFemale
Primary Taxonomy207RA0201X
Provider Legal NameAIDA JERAIR SIYAHIANCredential: MD
Location Address15503 VENTURA BLVD STE 170Encino, CA 91436-3145
Mailing Address5767 W Century Blvd Ste 400Los Angeles, CA 90045-5631 · (310) 301-5200
Phone(818) 461-8148
Fax(818) 461-8105
Sole ProprietorNo
Enumeration DateApril 13, 2020
Last NPPES UpdateOctober 1, 20263 updates tracked since enumeration
NPPES CertifiedOctober 1, 2026
✔ NPI 1891314563 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Allergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207RA0201X
License✔ Licensed in CA · A185031
Definition
An internist doctor of osteopathy that specializes in the treatment of allergy and immunologic disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Special Qualifications in the field of Allergy & Immunology.
Also ListedPediatricsTaxonomy 208000000X · License A185031 (CA)
15503 VENTURA BLVD STE 170, Encino, CA 91436
Open in Google Maps ↗

Secondary Practice Location 1

Location 14650 W Sunset BlvdLos Angeles, CA 90027-6062 · Phone (323) 361-2122

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Aida Jerair Siyahian 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.

Medicare Billing Reassignments

2

Medicare enrollment records show Aida Siyahian reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Regents Of The University Of California
6.0 mi
Internal Medicine
200 MEDICAL PLAZA, SUITE 365,530,420,250,120,214
Los Angeles, CA 90095
  • Reassigned Medicare billing, California enrollment
  • 1,766 clinicians in this Medicare group
NPI 1235107566 (310) 794-1276
Children's Hospital Los Angeles Medical Group, Inc.
11 mi
Multi-Specialty
4650 SUNSET BLVD
Los Angeles, CA 90027
  • Reassigned Medicare billing, California enrollment
  • Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
  • 1,281 clinicians in this Medicare group
NPI 1265530653 (323) 361-2337

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 91436 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
$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.

Other Providers at the Same Location NPPES 10

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

SAHAR SOHRABIAN MD
Internal Medicine (Cardiovascular Disease)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
LISA LI ZHU
Internal Medicine (Rheumatology)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
ARA A KARDASHIAN M.D.
Internal Medicine (Gastroenterology)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 618-1484
DR. POUYAN FAMINI M.D.
Internal Medicine (Endocrinology, Diabetes & Metabolism)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
DR. CAROLYN GOH M.D.
Dermatology
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
SCOTT BIN-TI HU M.D.
Internal Medicine (Pulmonary Disease)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
MELODY CHRISTINA AVAKIAN DO
Family Medicine (Adolescent Medicine)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148
SUSIE X FONG M.D.
Internal Medicine (Sleep Medicine)
15503 VENTURA BLVD STE 170
ENCINO, CA 91436
Los Angeles County (818) 461-8148

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 Aida Siyahian's NPI number?

The NPI number for Aida Siyahian is 1891314563. It was assigned to this individual provider in the NPPES registry on April 13, 2020.

Where is Aida Siyahian located?

Aida Siyahian practices at 15503 Ventura Blvd Ste 170, Encino, CA 91436. The listed phone number is (818) 461-8148.

What is Aida Siyahian's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.

Is Aida Siyahian enrolled in Medicare?

Yes. Aida Siyahian is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Aida Siyahian's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aida Siyahian reassigns Medicare benefits to 2 organizations: The Regents Of The University Of California (Los Angeles, CA) and Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA). 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 Aida Siyahian'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 Aida Siyahian was last updated on October 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.