DR. KHAI DO M.D.
NPI 1396939526
Internal Medicine in Santa Ana, CA

Q: What is Khai Do's NPI number?

The NPI number for Khai Do is 1396939526. It was assigned to this individual provider in the NPPES registry on August 30, 2007.

Q: What is Khai Do's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Khai Do was last updated on June 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since August 30, 2007PECOS EnrolledAccepts Medicare Assignment

2021 E 4TH ST STE 104, SANTA ANA, CA 92705(909) 621-3012(909) 621-3015 Get Directions Write a Review

NPPES record last updated: June 23, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Khai Do M.d. NPPES

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

DR. KHAI DO M.D. (NPI 1396939526) is an individual internal medicine provider in Santa Ana, California, licensed in California (A42932) and active in the NPI registry since August 2007. He is enrolled in Medicare PECOS and is a graduate of Louisiana State University School Of Medicine In New Orleans (1985).

NPPES Registry Identity

NPI1396939526

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. KHAI DOCredential: M.D.

Location Address2021 E 4TH ST STE 104Santa Ana, CA 92705-3912

Mailing Address9880 Central AveMontclair, CA 91763-2817 · (909) 621-3012 · Fax (909) 621-3016

Phone(909) 621-3012

Fax(909) 621-3015

Sole ProprietorNo

Medical School CMSLouisiana State University School Of Medicine In New OrleansGraduated 1985

Enumeration DateAugust 30, 2007

Last NPPES UpdateJune 23, 2026

NPPES CertifiedJune 23, 2026

✔ NPI 1396939526 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 · A42932

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.

2021 E 4TH ST STE 104, Santa Ana, CA 92705

Open in Google Maps ↗

Other Identifiers 1

OtherA42932CA · License Number

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. Khai Do 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 ID7214112390

PECOS Enrollment IDI20110505000300

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

Medicare enrollment records show Khai Do reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Thien Phuoc Medical Center Inc

9.1 mi

General Practice

250 HOSPITAL CIR
Westminster, CA 92683

Reassigned Medicare billing, California enrollment
2 clinicians in this Medicare group

NPI 1730851221 (714) 622-5593

Topcare Professional Medical Clinic, Inc

9.1 mi

General Practice

250 HOSPITAL CIR
Westminster, CA 92683

Reassigned Medicare billing, California enrollment
3 clinicians in this Medicare group

NPI 1417805615 (714) 373-0123

Khai Do MD Inc.

24 mi

Internal Medicine

9880 CENTRAL AVE
Montclair, CA 91763

Reassigned Medicare billing, California enrollment

NPI 1124496021 (909) 621-3012

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 92705 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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

4 suppliers36 claims56 services$4.41 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

4 suppliers27 claims27 services$0.71 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 Khai Do's NPI number?

The NPI number for Khai Do is 1396939526. It was assigned to this individual provider in the NPPES registry on August 30, 2007.

Where is Khai Do located?

Khai Do practices at 2021 E 4th St Ste 104, Santa Ana, CA 92705. The listed phone number is (909) 621-3012.

What is Khai Do's specialty?

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

Is Khai Do enrolled in Medicare?

Yes. Khai Do 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 Khai Do's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Khai Do reassigns Medicare benefits to 3 organizations: Thien Phuoc Medical Center Inc (Westminster, CA), Topcare Professional Medical Clinic, Inc (Westminster, CA) and Khai Do MD Inc. (Montclair, 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 Khai Do'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 Khai Do was last updated on June 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.