MARK IRWIN
NPI 1104453588
Internal Medicine - Infectious Disease in Knoxville, TN

Q: What is Mark Irwin's NPI number?

The NPI number for Mark Irwin is 1104453588. It was assigned to this individual provider in the NPPES registry on March 25, 2020.

Q: What is Mark Irwin's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Mark Irwin was last updated on July 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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 March 25, 2020PECOS EnrolledAccepts Medicare Assignment

501 19TH ST STE 600, KNOXVILLE, TN 37916(865) 525-4333 Get Directions Write a Review

NPPES record last updated: July 21, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jun 17, 2025, Jun 13, 2025, Mar 25, 2020 (3 updates tracked since 2020).

On this page

About Mark Irwin NPPES

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

MARK IRWIN (NPI 1104453588) is an individual infectious disease provider in Knoxville, Tennessee, licensed in Tennessee (6170) and active in the NPI registry since March 2020. He is enrolled in Medicare PECOS, is affiliated with Roane Medical Center, and is a graduate of Other (2020).

NPPES Registry Identity

NPI1104453588

Entity TypeIndividualMale

Primary Taxonomy207RI0200X

Provider Legal NameMARK IRWIN

Location Address501 19TH ST STE 600Knoxville, TN 37916-1852

Mailing Address201 19th Street, Suite 600, Trustees TowerKnoxville, TN 37916 · (865) 525-4333

Phone(865) 525-4333

Sole ProprietorNo

Medical School CMSOtherGraduated 2020

Enumeration DateMarch 25, 2020

Last NPPES UpdateJuly 21, 20253 updates tracked since enumeration

NPPES CertifiedJuly 21, 2025

✔ NPI 1104453588 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 TN · 6170

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.

501 19TH ST STE 600, Knoxville, TN 37916

Open in Google Maps ↗

Other Identifiers 1

MedicaidQ102113TN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BlueCross BlueShield of Tennessee.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 Irwin 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 ID9133544828

PECOS Enrollment IDI20250627000171

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.

Hospital Affiliations CMS Care Compare 3

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

Roane Medical Center

Acute Care Hospitals · Harriman, TN

5/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number440031

Location8045 Roane Medical Center DriveHarriman, TN 37748 · Roane County

Emergency services

Fort Sanders Regional Medical Center

Acute Care Hospitals · Knoxville, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440125

Location1901 W Clinch AveKnoxville, TN 37916 · Knox County

Emergency services Birthing friendly

Parkwest Medical Center

Acute Care Hospitals · Knoxville, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440173

Location9352 Park West BlvdKnoxville, TN 37923 · Knox County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37916 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

$121.80 typical visit price

range $52.64 – $160.89

Typical copayment $30.45 (range $13.16 – $40.22)

Most-billed visit code 99204

Established Patient

$93.60 typical visit price

range $16.72 – $131.41

Typical copayment $23.40 (range $4.18 – $32.85)

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.

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 Irwin's NPI number?

The NPI number for Mark Irwin is 1104453588. It was assigned to this individual provider in the NPPES registry on March 25, 2020.

Where is Mark Irwin located?

Mark Irwin practices at 501 19th St Ste 600, Knoxville, TN 37916. The listed phone number is (865) 525-4333.

What is Mark Irwin's specialty?

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

Is Mark Irwin enrolled in Medicare?

Yes. Mark Irwin 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 Irwin accept?

Health plans from BlueCross BlueShield of Tennessee list Mark Irwin 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 Mark Irwin affiliated with any hospitals?

According to CMS data, Mark Irwin is affiliated with Roane Medical Center, Fort Sanders Regional Medical Center and Parkwest Medical Center.

When was this NPI record last updated?

The NPPES record for Mark Irwin was last updated on July 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.