DR. MICHAEL JAMES KRIER M.D.
NPI 1497808414
Internal Medicine - Gastroenterology in Fairfield, CA

Q: What is Michael Krier's NPI number?

The NPI number for Michael Krier is 1497808414. It was assigned to this individual provider in the NPPES registry on January 21, 2007.

Q: What is Michael Krier's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Michael Krier was last updated on April 8, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.

Active since January 21, 2007PECOS EnrolledAccepts Medicare Assignment

101 BODIN CIR, FAIRFIELD, CA 94535(707) 423-4501 Get Directions Write a Review

NPPES record last updated: April 8, 2016. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Dr. Michael James Krier M.d. NPPES

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

DR. MICHAEL JAMES KRIER M.D. (NPI 1497808414) is an individual gastroenterology provider in Fairfield, California, licensed in California (A100295) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and is a graduate of Wright State University Boonshoft School Of Medicine (2004).

NPPES Registry Identity

NPI1497808414

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. MICHAEL JAMES KRIERCredential: M.D.

Location Address101 BODIN CIRFairfield, CA 94535-1809

Mailing Address1200 B Gale Wilson BlvdFairfield, CA 94533-3552 · (707) 646-4465 · Fax (707) 646-4902

Phone(707) 423-4501

Sole ProprietorNo

Medical School CMSWright State University Boonshoft School Of MedicineGraduated 2004

Enumeration DateJanuary 21, 2007

Last NPPES UpdateApril 8, 2016

✔ NPI 1497808414 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in CA · A100295

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.

101 BODIN CIR, Fairfield, CA 94535

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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. Michael James Krier 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 ID3173747383

PECOS Enrollment IDI20160419002549

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 Michael Krier reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Northbay Healthcare Group

4.0 mi

General Acute Care Hospital

1200 B GALE WILSON BLVD
Fairfield, CA 94533

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Northbay Physicians Surgery Center, LLC
516 clinicians in this Medicare group

NPI 1821147786 (707) 646-5000

Northbay Physicians Surgery Center LLC

5.9 mi

Ambulatory Surgical

1006 NUT TREE ROAD
Vacaville, CA 95687

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

NPI 1003015843 (707) 446-2800

Northbay Health Medical Foundation

9.7 mi

Internal Medicine

4500 BUSINESS CENTER DR
Fairfield, CA 94534

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

NPI 1760283527 (707) 646-3110

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 17

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

284 services205 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.

239 services234 patients

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.

157 services149 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

151 services130 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.

130 services129 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.

117 services116 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

88 services83 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

54 services54 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

48 services48 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.

38 services25 patients

Online digital evaluation and management service for an established patient for up to 7 days, total time 11-20 minutes 99422

This is a digital health service for existing patients. Over a week, your healthcare provider will assess and manage your health concerns online. The total time spent communicating will be between 11-20 minutes. This service offers convenience and continuous care.

38 services27 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

32 services31 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

28 services28 patients

Online digital evaluation and management service for an established patient for up to 7 days, total time 5-10 minutes 99421

This service involves a week-long digital assessment of your health status. It's conducted online by your healthcare provider, focusing on managing your existing health condition. The process takes 5-10 minutes of your time daily, ensuring optimal health management.

23 services20 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

21 services21 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.

13 services13 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94535 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

$145.83 typical visit price

range $65.02 – $191.95

Typical copayment $36.45 (range $16.25 – $47.98)

Most-billed visit code 99204

Established Patient

$113.05 typical visit price

range $21.86 – $157.69

Typical copayment $28.26 (range $5.46 – $39.42)

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.

EDWARD SEAN RODRIGUEZ I.D.M.T

Military Health Care Provider (Independent Duty Medical Technicians)

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (707) 423-5478

KENDRA MONICA HILL PT

Physical Therapist

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (707) 423-3000

TIMOTHY GUENTHER MD

Thoracic Surgery (Cardiothoracic Vascular Surgery)

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (707) 423-3000

ANGELA SABRINA GIESE MD

Surgery (Vascular Surgery)

101 BODIN CIR
FAIRFIELD, CA 94535

Solano County (707) 423-3000

DR. JOSCELYN D. A. C. AQUININGOC PHARMD

Pharmacist

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (626) 297-8649

MATTHEW NICHOLAS RIBEIRO MD

Anesthesiology

101 BODIN CIR
FAIRFIELD, CA 94535

Solano County (707) 423-3000

DR. ARTHUR JOSEPH MESTAS MD

Family Medicine

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (707) 423-7295

CATHERINE CELINE BRANSTETTER

Dentist (General Practice)

101 BODIN CIR
TRAVIS AFB, CA 94535

Solano County (707) 423-7085

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 Michael Krier's NPI number?

The NPI number for Michael Krier is 1497808414. It was assigned to this individual provider in the NPPES registry on January 21, 2007.

Where is Michael Krier located?

Michael Krier practices at 101 Bodin Cir, Fairfield, CA 94535. The listed phone number is (707) 423-4501.

What is Michael Krier's specialty?

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

Is Michael Krier enrolled in Medicare?

Yes. Michael Krier 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 Michael Krier's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Krier reassigns Medicare benefits to 3 organizations: Northbay Healthcare Group (Fairfield, CA), Northbay Physicians Surgery Center LLC (Vacaville, CA) and Northbay Health Medical Foundation (Fairfield, 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 Michael Krier'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 Michael Krier was last updated on April 8, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.