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DR. SIAMAK N NABILI M.D.
NPI 1407892490
Hospitalist in Irvine, CA

Active since June 20, 2006PECOS EnrolledAccepts Medicare Assignment
11 TECHNOLOGY DR, IRVINE, CA 92618(855) 206-6764(949) 923-3575 Get Directions Write a Review

NPPES record last updated: August 5, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 5, 2025, Nov 23, 2016, Oct 19, 2016 (3 updates tracked since 2016).

About Dr. Siamak N Nabili M.d. NPPES

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

DR. SIAMAK N NABILI M.D. (NPI 1407892490) is an individual hospitalist provider in Irvine, California, licensed in California (A83984) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of Other (2001).

NPPES Registry Identity

NPI1407892490
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameDR. SIAMAK N NABILICredential: M.D.
Location Address11 TECHNOLOGY DRIrvine, CA 92618-2302
Mailing AddressPo Box 35380Las Vegas, NV 89133-5380
Phone(855) 206-6764
Fax(949) 923-3575
Sole ProprietorNo
Medical School CMSOtherGraduated 2001
Enumeration DateJune 20, 2006
Last NPPES UpdateAugust 5, 20253 updates tracked since enumeration
NPPES CertifiedAugust 5, 2025
✔ NPI 1407892490 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in CA · A83984
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Also ListedInternal MedicineTaxonomy 207R00000X · License A83984 (CA)
11 TECHNOLOGY DR, Irvine, CA 92618
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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 and accepts Medicare assignment

Dr. Siamak N Nabili 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 ID7719953876
PECOS Enrollment IDI20040909000521
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

4

Medicare enrollment records show Siamak Nabili reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nili N. Alai, MD, Inc.
6.3 mi
Specialist
26081 MERIT CIR STE 109
Laguna Hills, CA 92653
  • Reassigned Medicare billing, California enrollment
  • 5 clinicians in this Medicare group
NPI 1952590135 (949) 582-7699
Celebrating Life Community Health Center
7.4 mi
Federally Qualified Health Center (FQHC)
27800 MEDICAL CENTER RD STE 110
Mission Viejo, CA 92691
  • Reassigned Medicare billing, California enrollment
  • 7 clinicians in this Medicare group
NPI 1386273100 (949) 866-3600
Healthcare Partners Affiliates Medical Group
7.8 mi
Addiction Medicine
14591 NEWPORT AVE
Tustin, CA 92780
  • Reassigned Medicare billing, California enrollment
  • 2,052 clinicians in this Medicare group
NPI 1891981502 (714) 442-4864
Centers For Family Medicine Gp
22 mi
Family Medicine
3460 KATELLA AVE
Los Alamitos, CA 90720
  • Reassigned Medicare billing, California enrollment
  • 228 clinicians in this Medicare group
NPI 1467598243 (562) 594-6599

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 92618 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
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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 20

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

DR. MARIA TERESA CORPIN AGNER MD
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. SHAHNOOS MAHDAVI M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. JUSTIN D HARRIS M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. SUBRATO GHOSH MD
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. PARAG SHARMA M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764
DR. HAI XUAN LE M.D.
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. MOLOOD HADI DO
Internal Medicine
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (949) 923-3200
DR. ALI AHOUI MD
Hospitalist
11 TECHNOLOGY DR
IRVINE, CA 92618
Orange County (855) 206-6764

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 Siamak Nabili's NPI number?

The NPI number for Siamak Nabili is 1407892490. It was assigned to this individual provider in the NPPES registry on June 20, 2006.

Where is Siamak Nabili located?

Siamak Nabili practices at 11 Technology Dr, Irvine, CA 92618. The listed phone number is (855) 206-6764.

What is Siamak Nabili's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Siamak Nabili enrolled in Medicare?

Yes. Siamak Nabili 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 Siamak Nabili's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Siamak Nabili reassigns Medicare benefits to 4 organizations: Nili N. Alai, MD, Inc. (Laguna Hills, CA), Celebrating Life Community Health Center (Mission Viejo, CA), Healthcare Partners Affiliates Medical Group (Tustin, CA) and Centers For Family Medicine Gp (Los Alamitos, 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 Siamak Nabili'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 Siamak Nabili was last updated on August 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.