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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. SAMUEL HOUSTON LIMBONG M.D.
NPI 1912358664
Internal Medicine in Tustin, CA

Active since June 23, 2016Opted out of Medicare · through Nov 1, 2027
2492 WALNUT AVE, TUSTIN, CA 92780(714) 709-8000 Get Directions Write a Review

NPPES record last updated: July 23, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Jul 23, 2026, Mar 7, 2023, May 28, 2020 and 1 more (4 updates tracked since 2016).

About Dr. Samuel Houston Limbong M.d. NPPES

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

DR. SAMUEL HOUSTON LIMBONG M.D. (NPI 1912358664) is an individual internal medicine provider in Tustin, California, licensed in California (A153140) and active in the NPI registry since June 2016. He has opted out of Medicare through November 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1912358664
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. SAMUEL HOUSTON LIMBONGCredential: M.D.
Location Address2492 WALNUT AVETustin, CA 92780-6953
Mailing Address2492 Walnut AveTustin, CA 92780-6953 · (714) 709-8000
Phone(714) 709-8000
Sole ProprietorNo
Enumeration DateJune 23, 2016
Last NPPES UpdateJuly 23, 20264 updates tracked since enumeration
NPPES CertifiedJuly 23, 2026
✔ NPI 1912358664 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A153140
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.
2492 WALNUT AVE, Tustin, CA 92780
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Samuel Houston Limbong M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from November 1, 2025 through November 1, 2027.

Opt-Out Effective DateNovember 1, 2025
Opt-Out In Effect ThroughNovember 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92780 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 8

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

RACHEL LIBONATI
Physical Therapist
2492 WALNUT AVE, #140
TUSTIN, CA 92780
Orange County (714) 544-2188
S M MULTISPECIALTY MEDICAL CORPORATION
Family Medicine
2492 WALNUT AVE, SUITE 110
TUSTIN, CA 92780
Orange County (714) 669-1997
ZHIYIN SHAN
Acupuncturist
2492 WALNUT AVE, SUITE 260
TUSTIN, CA 92780
Orange County (949) 600-4451
KARMEN COHEN D.O.
Family Medicine
2492 WALNUT AVE, 110
TUSTIN, CA 92780
Orange County (714) 669-1997
DONALD KUSKIN PHYSICAL THERAPIST
Physical Therapist
2492 WALNUT AVE, #140
TUSTIN, CA 92780
Orange County (714) 544-2188
KEVIN ALLARD P.T.
Physical Medicine & Rehabilitation
2492 WALNUT AVE, 110
TUSTIN, CA 92780
Orange County (714) 669-1997
LINDSAY MILLER DPT
Physical Therapist
2492 WALNUT AVE, #140
TUSTIN, CA 92780
Orange County (714) 544-2188
DR. JEAN LOUIS SELAM
Internal Medicine
2492 WALNUT AVE, SUITE # 130
TUSTIN, CA 92780
Orange County (714) 734-7944

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 Samuel Limbong's NPI number?

The NPI number for Samuel Limbong is 1912358664. It was assigned to this individual provider in the NPPES registry on June 23, 2016.

Where is Samuel Limbong located?

Samuel Limbong practices at 2492 Walnut Ave, Tustin, CA 92780. The listed phone number is (714) 709-8000.

What is Samuel Limbong's specialty?

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

Is Samuel Limbong enrolled in Medicare?

No. Samuel Limbong has opted out of Medicare through November 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Samuel Limbong was last updated on July 23, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.