MARKHAM L NIGHTENGALE M. D.
NPI 1144215971
Internal Medicine - Gastroenterology in Tulsa, OK

Q: What is the provider's specialty?

The provider's specialty is Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.

Active since September 19, 2005PECOS EnrolledAccepts Medicare Assignment

85.83/100

CMS Quality Rating

4200 E SKELLY DR STE 700, TULSA, OK 74135(918) 438-7050(918) 221-0835 Get Directions Write a Review

NPPES record last updated: March 19, 2025. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Mar 19, 2025, Mar 29, 2016 (2 updates tracked since 2016).

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About Markham L Nightengale M. D. NPPES

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

MARKHAM L NIGHTENGALE M. D. (NPI 1144215971) is an individual gastroenterology provider in Tulsa, Oklahoma, licensed in Oklahoma (18311) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, is affiliated with Muscogee (creek) Nation Medical Center, and is a graduate of Other (1988).

NPPES Registry Identity

NPI1144215971

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameMARKHAM L NIGHTENGALECredential: M. D.

Location Address4200 E SKELLY DR STE 700Tulsa, OK 74135-3256

Mailing AddressPo Box 305Lowell, AR 72745-0305 · (918) 481-4706 · Fax (918) 481-4765

Phone(918) 438-7050

Fax(918) 221-0835

Sole ProprietorNo

Medical School CMSOtherGraduated 1988

Enumeration DateSeptember 19, 2005

Last NPPES UpdateMarch 19, 20252 updates tracked since enumeration

NPPES CertifiedMarch 19, 2025

✔ NPI 1144215971 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 · 18311

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.

4200 E SKELLY DR STE 700, Tulsa, OK 74135

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Other Identifiers 1

Medicaid100131480AOK

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Home State Health, Ambetter from Sunflower Health Plan and more.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

Markham L Nightengale 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 ID6901830025

PECOS Enrollment IDI20100927000063, I20230103000458

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 14

Services this provider delivered to Medicare fee-for-service patients, from the 2024 & 2026 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.

224 services224 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.

175 services175 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.

157 services125 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

109 services100 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.

106 services106 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.

83 services76 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.

76 services76 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

Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month 99490

Chronic care management services involve a healthcare professional directing clinical staff in managing your chronic conditions. This includes the first 20 minutes per month of services like medication management, care coordination, and health monitoring to help improve your health and quality of life.

35 services13 patients

Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month 99439

Chronic Care Management services involve regular check-ins with healthcare professionals to manage two or more chronic conditions. It includes an additional 20 minutes of clinical staff time per month, directed by a healthcare professional, to ensure optimal health management.

32 services12 patients

New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more 99202

This service involves an initial visit to the doctor's office or other outpatient setting. It typically lasts between 15-29 minutes. The doctor will review your medical history, conduct a physical examination, and discuss your health concerns. It's a chance to establish your health baseline and address any immediate medical issues.

22 services22 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.

21 services21 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.

16 services16 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.

13 services13 patients

Hospital Affiliations CMS Care Compare 4

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

Muscogee (creek) Nation Medical Center

Acute Care Hospitals · Okmulgee, OK

OwnershipTribal

CMS Certification Number370057

Location1401 Morris DriveOkmulgee, OK 74447 · Okmulgee County

Emergency services

Saint Francis Hospital, Inc

Acute Care Hospitals · Tulsa, OK

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number370091

Location6161 South YaleTulsa, OK 74136 · Tulsa County

Emergency services Birthing friendly

Oklahoma Surgical Hospital, LLC

Acute Care Hospitals · Tulsa, OK

5/5 CMS rating

OwnershipPhysician

CMS Certification Number370210

Location2408 East 81st Street, Suite 300Tulsa, OK 74137 · Tulsa County

Emergency services

Saint Francis Hospital South, LLC

Acute Care Hospitals · Tulsa, OK

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number370218

Location10501 East 91st Street SouthTulsa, OK 74133 · Tulsa County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 74135 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.

85.83/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

90.74

Promoting Interoperability

100

Improvement Activities

Cost

51.95

Other Providers at the Same Location NPPES 3

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

DR. AATISH MUKESH PATEL M.D.

Internal Medicine (Gastroenterology)

4200 E SKELLY DR STE 700
TULSA, OK 74135

Tulsa County (918) 481-4700

DUSHYANT SINGH MD LLC

Internal Medicine (Gastroenterology)

4200 E SKELLY DR STE 700
TULSA, OK 74135

Tulsa County (918) 438-7050

ADULT GASTROENTEROLOGY ASSOCIATES INC

Internal Medicine (Gastroenterology)

4200 E SKELLY DR STE 700
TULSA, OK 74135

Tulsa County (918) 438-7050

MARKHAM L NIGHTENGALE M. D.
NPI 1144215971
Internal Medicine - Gastroenterology in Tulsa, OK

About Markham L Nightengale M. D. NPPES

NPPES Registry Identity

Specialties & Licenses

Other Identifiers 1

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare Enrollment Status

Areas of Expertise CMS Part B claims 14

Hospital Affiliations CMS Care Compare 4

Muscogee (creek) Nation Medical Center

Saint Francis Hospital, Inc

Oklahoma Surgical Hospital, LLC

Saint Francis Hospital South, LLC

Physician Visit Costs CMS claims · ZIP area

Medicare Quality Performance CMS QPP · MIPS

Other Providers at the Same Location NPPES 3

Frequently Asked Questions

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