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DR. WILLIAM C CHAPMAN JR. MD
NPI 1003297177
Colon & Rectal Surgery in Saint Louis, MO

Active since June 15, 2015PECOS EnrolledAccepts Medicare Assignment
70.27/100
CMS Quality Rating
1044 N MASON RD, DIV SURG COLON/RECTAL, STE 310, SAINT LOUIS, MO 63141(314) 454-7177(888) 425-7946 Get Directions Write a Review

NPPES record last updated: April 15, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 25, 2024, Apr 10, 2024, Aug 9, 2023 (3 updates tracked since 2023).

About Dr. William C Chapman Jr. Md NPPES

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

DR. WILLIAM C CHAPMAN JR. MD (NPI 1003297177) is an individual colon & rectal surgery provider in Saint Louis, Missouri, licensed in Missouri (2017007784) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and is a graduate of Georgetown University School Of Medicine (2015).

NPPES Registry Identity

NPI1003297177
Entity TypeIndividualMale
Primary Taxonomy208C00000X
Provider Legal NameDR. WILLIAM C CHAPMAN JR.Credential: MD
Location Address1044 N MASON RD, DIV SURG COLON/RECTAL, STE 310Saint Louis, MO 63141-6431
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 454-7177 · Fax (888) 425-7946
Phone(314) 454-7177
Fax(888) 425-7946
Sole ProprietorNo
Medical School CMSGeorgetown University School Of MedicineGraduated 2015
Enumeration DateJune 15, 2015
Last NPPES UpdateApril 15, 20253 updates tracked since enumeration
✔ NPI 1003297177 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyColon & Rectal SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208C00000X
License✔ Licensed in MO · 2017007784
Definition
A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.
Also ListedSurgeryTaxonomy 208600000X · License 2017007784 (MO)
1044 N MASON RD, Saint Louis, MO 63141
Open in Google Maps ↗

Other Identifiers 1

Medicaid200044671MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cox HealthPlans.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William C Chapman Jr. Md 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 ID3274847876
PECOS Enrollment IDI20230606000999
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.

Areas of Expertise CMS Part B claims 4

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 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.
32 services27 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.
30 services30 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.
17 services17 patients
Diagnostic exam of anus using an endoscope 46600
This procedure involves using a thin, flexible instrument called an endoscope to examine the anal area. It helps detect any abnormal conditions or issues. It's a safe, routine exam performed by a healthcare professional.
14 services11 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Barnes-Jewish West County Hospital

Acute Care Hospitals · Creve Coeur, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260162
Location12634 Olive BoulevardCreve Coeur, MO 63141 · St. Louis County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 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
$86.32 typical visit price
range $55.65 – $169.38
Typical copayment $21.58 (range $13.91 – $42.34)
Most-billed visit code 99203
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

70.27/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality74.77
Promoting Interoperability97
Improvement Activities40
Cost21.68

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.

MS. ELIZABETH BURTON WALDEN- PRATER AGNP
Nurse Practitioner
1044 N MASON RD, DIV IM GENERAL MED, STE 330
SAINT LOUIS, MO 63141
St. Louis County (314) 996-8103
MS. ALEXANDRA ELIZABETH GRAHAM PA
Physician Assistant
1044 N MASON RD, DIV IM ENDOCRINOLOGY, STE 330
SAINT LOUIS, MO 63141
St. Louis County (314) 362-3500
MS. ALICIA MARIE STORTS FNP
Nurse Practitioner (Family)
1044 N MASON RD, DEPT ORTHOPAEDIC SURGERY, STE 110/210
SAINT LOUIS, MO 63141
St. Louis County (314) 514-3500
DR. RICHARD IAN STEIN PHD
Psychologist (Clinical)
1044 N MASON RD, DIV IM GERIATRIC MED, STE 330
SAINT LOUIS, MO 63141
St. Louis County (314) 286-2080
DR. HEIDI HOPE TASTET MD
Internal Medicine
1044 N MASON RD, DIV IM GENERAL MED, STE 330
SAINT LOUIS, MO 63141
St. Louis County (314) 996-8103
MS. CARLY ROSE NOVELLY SLP
Speech-Language Pathologist
1044 N MASON RD, DEPT OTOLARYNGOLOGY, STE L20
CREVE COEUR, MO 63141
St. Louis County (314) 362-7509
DR. JAY F PICCIRILLO MD
Otolaryngology
1044 N MASON RD, DEPT OTOLARYNGOLOGY, STE L20
CREVE COEUR, MO 63141
St. Louis County (314) 362-7509
MS. SHANNA MARIE ZWICK PA
Physician Assistant (Surgical)
1044 N MASON RD, DIV SURG COLON/RECTAL, STE 310
SAINT LOUIS, MO 63141
St. Louis County (314) 454-7177

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 Chapman's NPI number?

The NPI number for William Chapman is 1003297177. It was assigned to this individual provider in the NPPES registry on June 15, 2015.

Where is William Chapman located?

William Chapman practices at 1044 N Mason Rd Div Surg Colon/Rectal, Ste 310, Saint Louis, MO 63141. The listed phone number is (314) 454-7177.

What is William Chapman's specialty?

The primary specialty registered for this NPI is Colon & Rectal Surgery with taxonomy code 208C00000X.

Is William Chapman enrolled in Medicare?

Yes. William Chapman 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.

What insurance does William Chapman accept?

Health plans from Cox HealthPlans list William Chapman as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Chapman affiliated with any hospitals?

According to CMS data, William Chapman is affiliated with Barnes Jewish Hospital, Missouri Baptist Medical Center and Barnes-Jewish West County Hospital.

When was this NPI record last updated?

The NPPES record for William Chapman was last updated on April 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.