DR. MARK D WILLIAMS MD
NPI 1659461564
Internal Medicine - Pulmonary Disease in Indianapolis, IN

Q: What is Mark Williams's NPI number?

The NPI number for Mark Williams is 1659461564. It was assigned to this individual provider in the NPPES registry on October 13, 2006.

Q: What is Mark Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

Q: When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on March 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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 October 13, 2006PECOS EnrolledAccepts Medicare Assignment

1801 N SENATE AVE, SUITE 230, INDIANAPOLIS, IN 46202(317) 962-5820(317) 962-3916 Get Directions Write a Review

NPPES record last updated: March 15, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 15, 2025, Nov 25, 2020 (2 updates tracked since 2020).

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About Dr. Mark D Williams Md NPPES

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

DR. MARK D WILLIAMS MD (NPI 1659461564) is an individual pulmonary disease provider in Indianapolis, Indiana, licensed in Indiana (01041431A) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Indiana University Health, and maintains a secondary practice location in Indianapolis.

NPPES Registry Identity

NPI1659461564

Entity TypeIndividualMale

Primary Taxonomy207RP1001X

Provider Legal NameDR. MARK D WILLIAMSCredential: MD

Location Address1801 N SENATE AVE, SUITE 230Indianapolis, IN 46202-1252

Mailing Address250 N Shadeland AveIndianapolis, IN 46219-4959

Phone(317) 962-5820

Fax(317) 962-3916

Sole ProprietorNo

Medical School CMSIndiana University School Of MedicineGraduated 1990

Enumeration DateOctober 13, 2006

Last NPPES UpdateMarch 15, 20252 updates tracked since enumeration

NPPES CertifiedMarch 15, 2025

✔ NPI 1659461564 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RP1001X

License✔ Licensed in IN · 01041431A

Definition

An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.

1801 N SENATE AVE, Indianapolis, IN 46202

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Secondary Practice Location 1

Location 11701 N Senate BlvdIndianapolis, IN 46202-1239 · Phone (888) 484-3258

Other Identifiers 1

Medicaid200104270IN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health 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

Dr. Mark D Williams 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 ID1153588199

PECOS Enrollment IDI20120202000899

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

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

Indiana University Health

Acute Care Hospitals · Indianapolis, IN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number150056

Location1701 N Senate BlvdIndianapolis, IN 46202 · Marion County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 46202 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

$122.49 typical visit price

range $53.07 – $161.76

Typical copayment $30.62 (range $13.26 – $40.44)

Most-billed visit code 99204

Established Patient

$94.22 typical visit price

range $16.93 – $132.22

Typical copayment $23.55 (range $4.23 – $33.05)

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 11

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

DR. DANIELLE K MULLINS PHARMD

Pharmacist

1801 N SENATE AVE
INDIANAPOLIS, IN 46202

Marion County (317) 962-5606

INDIANAPOLIS NEUROSURGICAL GROUP

General Acute Care Hospital

1801 N SENATE AVE, SUITE 535
INDIANAPOLIS, IN 46202

Marion County (317) 396-1300

RONALD MASTOURI MD

Internal Medicine (Cardiovascular Disease)

1801 N SENATE AVE, MPC II STE. 4000
INDIANAPOLIS, IN 46202

Marion County (317) 962-0095

JENNIFER E MITCHELL BSN CCRN RN

Registered Nurse (Critical Care Medicine)

1801 N SENATE AVE
INDIANAPOLIS, IN 46202

Marion County (317) 962-2000

SHANELLE REYNOLDS NP

Nurse Practitioner (Family)

1801 N SENATE AVE
INDIANAPOLIS, IN 46202

Marion County (317) 962-2500

DEENA S TOALSON R.PH.

Pharmacist

1801 N SENATE AVE, RM 105
INDIANAPOLIS, IN 46202

Marion County (317) 962-5607

DR. ERIN JANE RODMAN PHARMD

Pharmacist

1801 N SENATE AVE
INDIANAPOLIS, IN 46202

Marion County (317) 962-5606

LAURIE SCHENKELBERG PHARMD

Pharmacist (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist)

1801 N SENATE AVE
INDIANAPOLIS, IN 46202

Marion County (414) 708-1621

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 Williams's NPI number?

The NPI number for Mark Williams is 1659461564. It was assigned to this individual provider in the NPPES registry on October 13, 2006.

Where is Mark Williams located?

Mark Williams practices at 1801 N Senate Ave Suite 230, Indianapolis, IN 46202. The listed phone number is (317) 962-5820.

What is Mark Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

Is Mark Williams enrolled in Medicare?

Yes. Mark Williams 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 Williams accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian and CareSource list Mark Williams 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 Williams affiliated with any hospitals?

According to CMS data, Mark Williams is affiliated with Indiana University Health.

When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on March 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.