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DR. WILLIAM STASSEN M.D.
NPI 1548245079
Internal Medicine - Gastroenterology in Austin, TX

Active since December 07, 2005
79.43/100
CMS Quality Rating
8015 SHOAL CREEK BLVD STE 118, AUSTIN, TX 78757(512) 244-2273(512) 671-7883 Get Directions Write a Review

NPPES record last updated: January 8, 2013. Verified against the NPPES registry weekly; last sync: October 04, 2026.

About Dr. William Stassen M.d. NPPES

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

DR. WILLIAM STASSEN M.D. (NPI 1548245079) is an individual gastroenterology provider in Austin, Texas, licensed in Texas (G7893) and active in the NPI registry since December 2005.

NPPES Registry Identity

NPI1548245079
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. WILLIAM STASSENCredential: M.D.
Location Address8015 SHOAL CREEK BLVD STE 118Austin, TX 78757-8052
Mailing AddressPo Box 10597Austin, TX 78766-1597 · (512) 485-5878 · Fax (512) 420-0397
Phone(512) 244-2273
Fax(512) 671-7883
Sole ProprietorNo
Enumeration DateDecember 7, 2005
Last NPPES UpdateJanuary 8, 2013
✔ NPI 1548245079 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 TX · G7893
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.
8015 SHOAL CREEK BLVD STE 118, Austin, TX 78757
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Other Identifiers 3

Medicare PIN8311M0TX
Medicare UPINB26663TX
Medicare PIN8312M3TX

Areas of Expertise CMS Part B claims 10

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 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.
137 services137 patients
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.
129 services112 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.
78 services78 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.
58 services57 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.
41 services41 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.
32 services32 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

79.43/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality52.61
Promoting Interoperability100
Improvement Activities40
Cost78.84

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 William Stassen's NPI number?

The NPI number for William Stassen is 1548245079. It was assigned to this individual provider in the NPPES registry on December 7, 2005.

Where is William Stassen located?

William Stassen practices at 8015 Shoal Creek Blvd Ste 118, Austin, TX 78757. The listed phone number is (512) 244-2273.

What is William Stassen's specialty?

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

When was this NPI record last updated?

The NPPES record for William Stassen was last updated on January 8, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.