1. Home
  2. Directory
  3. California
  4. Oroville
  5. Internal Medicine
  6. NPI Profile

ALEXANDER TONTHAT MD, MBA
NPI 1124522784
Internal Medicine - Gastroenterology in Oroville, CA

Active since March 20, 2018PECOS EnrolledAccepts Medicare Assignment
2767 OLIVE HWY STE 9D, OROVILLE, CA 95966(530) 533-8500 Get Directions Write a Review

NPPES record last updated: July 31, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 31, 2024, Apr 30, 2024, Mar 20, 2018 (3 updates tracked since 2018).

About Alexander Tonthat Md, Mba NPPES

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

ALEXANDER TONTHAT MD, MBA (NPI 1124522784) is an individual gastroenterology provider in Oroville, California, licensed in California (A164621) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of Temple University School Of Medicine (2018).

NPPES Registry Identity

NPI1124522784
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameALEXANDER TONTHATCredential: MD, MBA
Location Address2767 OLIVE HWY STE 9DOroville, CA 95966-6118
Mailing Address1958 Crescent DrSignal Hill, CA 90755-5600 · (562) 262-1767
Phone(530) 533-8500
Sole ProprietorNo
Medical School CMSTemple University School Of MedicineGraduated 2018
Enumeration DateMarch 20, 2018
Last NPPES UpdateJuly 31, 20243 updates tracked since enumeration
NPPES CertifiedJuly 31, 2024
✔ NPI 1124522784 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in CA · A164621
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
2767 OLIVE HWY STE 9D, Oroville, CA 95966
Open in Google Maps ↗

Secondary Practice Location 1

Location 11200 N State St., Clinic Tower, Suite A7DLos Angeles, CA 90033-1029 · Phone (562) 262-1767

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

Alexander Tonthat Md, Mba 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 ID4385976604
PECOS Enrollment IDI20240827001773
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 Reassignment

Medicare enrollment records show Alexander Tonthat reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Orohealth Corporation A Non Profit Healthcare System
0.1 mi
Family Medicine
2767 OLIVE HWY
Oroville, CA 95966
  • Reassigned Medicare billing, California enrollment
  • 267 clinicians in this Medicare group
NPI 1013933167 (530) 533-8500

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

Areas of Expertise CMS Part B claims 7

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
116 services108 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
94 services52 patients
Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
88 services86 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
87 services81 patients
Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385
This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
69 services69 patients
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito G0500
Moderate sedation is a method where a physician uses medication to help you relax during a gastrointestinal endoscopy. An independent trained observer will be present to monitor your vital signs and ensure your safety throughout the procedure. It's a common and safe practice.
28 services28 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95966 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
$133.94 typical visit price
range $58.87 – $176.60
Typical copayment $33.48 (range $14.71 – $44.15)
Most-billed visit code 99204
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
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

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

Respiratory assist device, bi-level pressure capability, with back-up rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) E0471
DME-Other DME · category DE001N
1 supplier12 claims12 services$178.65 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 Alexander Tonthat's NPI number?

The NPI number for Alexander Tonthat is 1124522784. It was assigned to this individual provider in the NPPES registry on March 20, 2018.

Where is Alexander Tonthat located?

Alexander Tonthat practices at 2767 Olive Hwy Ste 9D, Oroville, CA 95966. The listed phone number is (530) 533-8500.

What is Alexander Tonthat's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Alexander Tonthat enrolled in Medicare?

Yes. Alexander Tonthat 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 organization bills Medicare for Alexander Tonthat's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Tonthat reassigns Medicare benefits to Orohealth Corporation A Non Profit Healthcare System (Oroville, CA). The 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 Alexander Tonthat'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 Alexander Tonthat was last updated on July 31, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.