1. Home
  2. Directory
  3. Arkansas
  4. Fort Smith
  5. Internal Medicine
  6. NPI Profile

MARK L STILLWELL M.D.
NPI 1568459451
Internal Medicine - Infectious Disease in Fort Smith, AR

Active since October 05, 2005PECOS EnrolledAccepts Medicare Assignment
6801 ROGERS AVE FL 5, FORT SMITH, AR 72903(479) 274-4100(479) 274-4199 Get Directions Write a Review

NPPES record last updated: October 18, 2024. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mark L Stillwell M.d. NPPES

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

MARK L STILLWELL M.D. (NPI 1568459451) is an individual infectious disease provider in Fort Smith, Arkansas, licensed in Arkansas (N7411) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS and is a graduate of University Of Maryland School Of Medicine (1982).

NPPES Registry Identity

NPI1568459451
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameMARK L STILLWELLCredential: M.D.
Location Address6801 ROGERS AVE FL 5Fort Smith, AR 72903-4067
Mailing AddressPo Box 776084Chicago, IL 60677-6084 · (479) 284-4100 · Fax (314) 364-6321
Phone(479) 274-4100
Fax(479) 274-4199
Sole ProprietorYes
Medical School CMSUniversity Of Maryland School Of MedicineGraduated 1982
Enumeration DateOctober 5, 2005
Last NPPES UpdateOctober 18, 2024
NPPES CertifiedOctober 18, 2024
✔ NPI 1568459451 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in AR · N7411
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
6801 ROGERS AVE FL 5, Fort Smith, AR 72903
Open in Google Maps ↗

Other Identifiers 2

Medicaid114655001AR
Medicaid100123480AAR

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Arkansas Blue Cross and Blue Shield, Health Advantage, Octave.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

Mark L Stillwell 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 ID4082682265
PECOS Enrollment IDI20040924000537
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 3

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
61 services18 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.
42 services16 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.
23 services21 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 72903 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
$119.36 typical visit price
range $51.36 – $157.74
Typical copayment $29.84 (range $12.84 – $39.43)
Most-billed visit code 99204
Established Patient
$91.63 typical visit price
range $16.16 – $128.77
Typical copayment $22.90 (range $4.04 – $32.19)
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 6

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

MRS. JOANNE JOHNSON APRN
Nurse Practitioner
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4100
DR. LESLIE THOMPSON ZIEGLER M.D.
Internal Medicine
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4100
JENNA CLARK MS, RD, LD, CPT
Dietitian, Registered
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4100
CHETAN RASIKLAL SONI MD
Ophthalmology
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4400
BROOKE HOUSER
Optometrist
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4400
SHAY A BARFIELD APRN
Nurse Practitioner (Family)
6801 ROGERS AVE FL 5
FORT SMITH, AR 72903
Sebastian County (479) 274-4100

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 Mark Stillwell's NPI number?

The NPI number for Mark Stillwell is 1568459451. It was assigned to this individual provider in the NPPES registry on October 5, 2005.

Where is Mark Stillwell located?

Mark Stillwell practices at 6801 Rogers Ave Fl 5, Fort Smith, AR 72903. The listed phone number is (479) 274-4100.

What is Mark Stillwell's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Mark Stillwell enrolled in Medicare?

Yes. Mark Stillwell 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 Mark Stillwell accept?

Health plans from Arkansas Blue Cross and Blue Shield, Health Advantage and Octave list Mark Stillwell 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.

When was this NPI record last updated?

The NPPES record for Mark Stillwell was last updated on October 18, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 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.