DR. ADRIENNE J NGUYEN MD
NPI 1376635219
Internal Medicine - Gastroenterology in San Carlos, CA

NPI Status: Active since September 29, 2006

Contact Information

1000 LAUREL ST
SAN CARLOS, CA
ZIP 94070
Phone: (650) 596-8800
Fax: (650) 596-8802

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  • Individual
  • Female
  • Years of Experience 30
  • Internal Medicine
  • Gastroenterology
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About ADRIENNE NGUYEN

This page provides the complete NPI Profile along with additional information for Adrienne Nguyen, an internist established in San Carlos, California with a medical specialization in Internal Medicine, focusing in gastroenterology and more than 30 years of experience. She graduated from University Of Missouri, Kansas City, School Of Medicine in 1996. The healthcare provider is registered in the NPI registry with number 1376635219 assigned on September 2006. The practitioner's primary taxonomy code is 207RG0100X with license number C53504 (CA). The provider is registered as an individual and her NPI record was last updated June 2026.

NPI
1376635219
Provider Name
DR. ADRIENNE J NGUYEN MD
Gender
Female
Entity Type
Individual
Location Address
1000 LAUREL ST SAN CARLOS, CA 94070
Location Phone
(650) 596-8800
Location Fax
(650) 596-8802
Mailing Address
1000 LAUREL ST SAN CARLOS, CA 94070
Mailing Phone
(650) 596-8800
Mailing Fax
(650) 596-8802
Medical School Name
UNIVERSITY OF MISSOURI, KANSAS CITY, SCHOOL OF MEDICINE
Graduation Year
1996
Is Sole Proprietor?
No
Enumeration Date
09-29-2006
Last Update Date
06-03-2026
Code Navigator

An internist like Adrienne Nguyen is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Secondary Locations

  • 6500 Hospital Dr
    Hannibal, MO 63401
    (573) 629-3491
  • 6000 Hospital Dr
    Hannibal, MO 63401
    (573) 248-1300

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Gastroenterology

Taxonomy Code
207RG0100X
Type
Allopathic & Osteopathic Physicians
License No.
C53504
License State
CA
Taxonomy Description
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207RG0100XAllopathic & Osteopathic Physicians

Internal Medicine
Gastroenterology

2013009358 (MO)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Anthem Bronze Pathway 10150 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Bronze Pathway 6900 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Bronze Pathway 7500 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Catastrophic Pathway (+ Incentives) - EPO
  • Anthem Gold Pathway 2000 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Heart Healthy Bronze Pathway 4900 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Heart Healthy Silver Pathway 3100 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Silver Pathway 5350 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Silver Pathway 6000 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Anthem Silver Pathway 7200 ($0 Virtual PCP + $0 Select Drugs + Incentives) - EPO
  • Blue KC Catastrophic BlueSelect EPO - EPO
  • Blue KC Choice Bronze 2 with Spira Care BlueSelect EPO - EPO
  • Blue KC Choice Silver 1 with Spira Care BlueSelect EPO - EPO
  • Blue KC Community Silver Preferred-Care Blue EPO - EPO
  • Blue KC First Bronze Preferred-Care Blue EPO - EPO
  • Blue KC Standard Bronze BlueSelect EPO - EPO
  • Blue KC Standard Bronze Preferred-Care Blue EPO - EPO
  • Blue KC Standard Gold BlueSelect EPO - EPO
  • Blue KC Standard Gold Preferred-Care Blue EPO - EPO
  • Blue KC Standard Silver BlueSelect EPO - EPO
  • Blue KC Standard Silver Preferred-Care Blue EPO - EPO
  • Bronze Classic 4700 - EPO
  • Bronze Classic Standard - EPO
  • Bronze Elite + PCP Saver - EPO
  • Bronze Elite + PCP Saver Plus - EPO
  • Bronze Simple Diabetes - EPO
  • Gold Classic Standard - EPO
  • Gold Simple - EPO
  • Silver Classic Standard - EPO
  • Silver Elite Saver Plus - EPO
  • Silver Simple Diabetes - EPO
  • Silver Simple PCP Saver - EPO
  • Silver Simple Women's Health with Menopause Benefits - EPO

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Medicare Participation & PECOS Enrollment Status

Adrienne Nguyen is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Adrienne Nguyen is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 5092751743

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20130426000117, I20250903000754

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes

Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.

This service was performed 62 times for 61 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes

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.

This service was performed 36 times for 35 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes

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.

This service was performed 156 times for 130 patients

Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes

Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.

This service was performed 14 times for 11 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $38.45 for a new patient copayment and $29.87 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 94070 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $153.83
  • Minimum New Patient Price $69
  • Maximum New Patient Price $202.35
  • Average New Patient Copayment $38.45
  • Minimum New Patient Copayment $17.25
  • Maximum New Patient Copayment $50.58

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $119.48
  • Minimum Established Patient Price $23.44
  • Maximum Established Patient Price $166.46
  • Average Established Patient Copayment $29.87
  • Minimum Established Patient Copayment $5.86
  • Maximum Established Patient Copayment $41.61

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Adrienne Nguyen is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
MEDSTAR FRANKLIN SQUARE MEDICAL CENTER9000 FRANKLIN SQUARE DRIVE
ROSEDALE, MD 21237
(443) 777-7850Acute Care Hospitals
MEDSTAR UNION MEMORIAL HOSPITAL201 EAST UNIVERSITY PARKWAY
BALTIMORE, MD 21218
(410) 554-2227Acute Care Hospitals
MEDSTAR HARBOR HOSPITAL3001 SOUTH HANOVER STREET
BALTIMORE, MD 21225
(410) 350-3201Acute Care Hospitals
MEDSTAR GOOD SAMARITAN HOSPITAL5601 LOCH RAVEN BOULEVARD
BALTIMORE, MD 21239
(443) 444-3902Acute Care Hospitals
HANNIBAL REGIONAL HOSPITAL6000 HOSPITAL DR
HANNIBAL, MO 63401
(573) 248-1300Acute Care Hospitals

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1376635219, we treat the final digit (9) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 51. The final step is to find the difference between that total and the next multiple of ten (60 - 51 = 9).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
3
Unchanged
Pos 3
7
Doubled → 14 → 1 + 4
Pos 4
6
Unchanged
Pos 5
6
Doubled → 12 → 1 + 2
Pos 6
3
Unchanged
Pos 7
5
Doubled → 10 → 1 + 0
Pos 8
2
Unchanged
Pos 9
1
Doubled → 2
Check
9
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 7 → 14 → 5 6 → 12 → 3 5 → 10 → 1 1 → 2

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 3 + 1 + 4 + 6 + 1 + 2 + 3 + 1 + 0 + 2 + 2 + 24 = 51

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 51 is 60. The difference is the calculated check digit.

60 - 51 = 9
This NPI is valid
The calculated check digit is 9, which matches the last digit of 1376635219.

Other Providers at the Same Location


The following 8 providers are registered at the same or a nearby location.

Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070
Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070
Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070
Clinical Medical Laboratory
1000 LAUREL ST
SAN CARLOS, CA 94070
Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070
Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070
Clinical Medical Laboratory
1000 LAUREL ST
SAN CARLOS, CA 94070
Internal Medicine (Gastroenterology)
1000 LAUREL ST
SAN CARLOS, CA 94070

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1376635219, enumerated as an "individual" on September 29, 2006.

The provider is located at 1000 LAUREL ST SAN CARLOS, CA 94070 and the phone number is (650) 596-8800.

Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.

The provider might be accepting Accepts: Anthem Blue Cross and Blue Shield, Blue Cross and. Please consult your insurance carrier or call the provider to verify.

Adrienne Nguyen is affiliated with: MEDSTAR FRANKLIN SQUARE MEDICAL CENTER, MEDSTAR UNION MEMORIAL HOSPITAL, MEDSTAR HARBOR HOSPITAL, MEDSTAR GOOD SAMARITAN HOSPITAL and HANNIBAL REGIONAL HOSPITAL.