DR. CLINTON GRAVES WALLIS M.D.
NPI 1255384483
Internal Medicine - Gastroenterology in Oklahoma City, OK

Q: What is Clinton Wallis's NPI number?

The NPI number for Clinton Wallis is 1255384483. It was assigned to this individual provider in the NPPES registry on May 18, 2006.

Q: What is Clinton Wallis'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 Clinton Wallis was last updated on February 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.

Active since May 18, 2006PECOS EnrolledAccepts Medicare Assignment

6516 N OLIE AVE STE A, OKLAHOMA CITY, OK 73116(405) 486-6960(405) 486-6961 Get Directions Write a Review

NPPES record last updated: February 17, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Feb 17, 2025, Jan 13, 2023 (2 updates tracked since 2023).

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About Dr. Clinton Graves Wallis M.d. NPPES

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

DR. CLINTON GRAVES WALLIS M.D. (NPI 1255384483) is an individual gastroenterology provider in Oklahoma City, Oklahoma, licensed in Oklahoma (24646) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS, is affiliated with Integris Baptist Medical Center, Inc, and is a graduate of Other (1998).

NPPES Registry Identity

NPI1255384483

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. CLINTON GRAVES WALLISCredential: M.D.

Location Address6516 N OLIE AVE STE AOklahoma City, OK 73116-7399

Mailing Address6516 N Olie Ave Ste AOklahoma City, OK 73116-7399 · (405) 486-6960 · Fax (405) 486-6961

Phone(405) 486-6960

Fax(405) 486-6961

Sole ProprietorNo

Medical School CMSOtherGraduated 1998

Enumeration DateMay 18, 2006

Last NPPES UpdateFebruary 17, 20252 updates tracked since enumeration

NPPES CertifiedFebruary 17, 2025

✔ NPI 1255384483 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 OK · 24646

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.

6516 N OLIE AVE STE A, Oklahoma City, OK 73116

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Oklahoma, CommunityCare, UnitedHealthcare.Insurance ›

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. Clinton Graves Wallis 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 ID6901819168

PECOS Enrollment IDI20060718000281

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 Clinton Wallis reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Integris Ddsi Endoscopy Centers LLC

3.2 mi

Ambulatory Surgical

10029 N OKLAHOMA AVE STE 100
Oklahoma City, OK 73114

Reassigned Medicare billing, Oklahoma enrollment
Also billed through NPI 1760074207 (Oklahoma)
18 clinicians in this Medicare group

NPI 1497347934 (405) 702-1300

Hpi Physicians LLC

7.0 mi

General Practice

1616 S KELLY AVE
Edmond, OK 73013

Reassigned Medicare billing, Oklahoma enrollment
82 clinicians in this Medicare group

NPI 1205152600 (405) 341-8829

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 11

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.

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.

245 services241 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.

219 services211 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope 43248

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

169 services164 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.

59 services59 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.

58 services58 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.

43 services42 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.

43 services41 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.

42 services35 patients

Removal of polyps or growths of esophagus, stomach, and/or upper small bowel using an endoscope with mechanical snare 43251

This procedure involves the use of a thin, flexible instrument called an endoscope to visualize and remove abnormal growths, known as polyps, from the esophagus, stomach, or upper small bowel. A tool called a mechanical snare is used to safely cut and remove these growths.

29 services28 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.

26 services24 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.

15 services15 patients

Hospital Affiliations CMS Care Compare 4

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

Integris Baptist Medical Center, Inc

Acute Care Hospitals · Oklahoma City, OK

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number370028

Location3300 Northwest ExpresswayOklahoma City, OK 73112 · Oklahoma County

Emergency services Birthing friendly

Ssm Health St Anthony Hospital - Oklahoma City

Acute Care Hospitals · Oklahoma City, OK

2/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number370037

Location1000 North Lee AvenueOklahoma City, OK 73101 · Oklahoma County

Emergency services Birthing friendly

Community Hospital, LLC

Acute Care Hospitals · Oklahoma City, OK

5/5 CMS rating

OwnershipPhysician

CMS Certification Number370203

Location3100 Southwest 89th StreetOklahoma City, OK 73159 · Oklahoma County

Emergency services

Integris Health Edmond Hospital

Acute Care Hospitals · Edmond, OK

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number370236

Location4801 Integris ParkwayEdmond, OK 73034 · Oklahoma County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 73116 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

$123.06 typical visit price

range $53.00 – $162.61

Typical copayment $30.76 (range $13.25 – $40.65)

Most-billed visit code 99204

Established Patient

$94.27 typical visit price

range $16.68 – $132.40

Typical copayment $23.56 (range $4.17 – $33.10)

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.

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.

Reported Quality Measures

Age Appropriate Screening Colonoscopy

Lower rates are better for this measure.

0%1,164 patients

Appropriate follow-up interval based on pathology findings in screening colonoscopy

91%390 patients

Appropriate Follow-Up Interval for Normal Colonoscopy in Average Risk Patients

91%462 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

AMY JAMES PA-C

Physician Assistant

6516 N OLIE AVE STE A
OKLAHOMA CITY, OK 73116

Oklahoma County (405) 486-6960

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 Clinton Wallis's NPI number?

The NPI number for Clinton Wallis is 1255384483. It was assigned to this individual provider in the NPPES registry on May 18, 2006.

Where is Clinton Wallis located?

Clinton Wallis practices at 6516 N Olie Ave Ste A, Oklahoma City, OK 73116. The listed phone number is (405) 486-6960.

What is Clinton Wallis's specialty?

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

Is Clinton Wallis enrolled in Medicare?

Yes. Clinton Wallis 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 Clinton Wallis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Clinton Wallis reassigns Medicare benefits to 2 organizations: Integris Ddsi Endoscopy Centers LLC (Oklahoma City, OK) and Hpi Physicians LLC (Edmond, OK). 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 Clinton Wallis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Clinton Wallis accept?

Health plans from Blue Cross and Blue Shield of Oklahoma, CommunityCare and UnitedHealthcare list Clinton Wallis 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 Clinton Wallis affiliated with any hospitals?

According to CMS data, Clinton Wallis is affiliated with Integris Baptist Medical Center, Inc, Ssm Health St Anthony Hospital - Oklahoma City, Community Hospital, LLC and Integris Health Edmond Hospital.

When was this NPI record last updated?

The NPPES record for Clinton Wallis was last updated on February 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.