Dr. Mark Williams MD
About this NPIWhat this record shows.
NPI 1659461564 is registered to Dr. Mark Williams MD, a Pulmonary Disease Physician practising at 1801 N Senate Ave, Suite 230 in Indianapolis, Indiana. Pulmonary Disease Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Dr. Mark Williams MD has been enumerated in the National Provider Identifier (NPI) registry since 2006.
Your brand here.
Secondary identifiers
Additional identifiers this provider has registered with NPPES. Used by medical billers, credentialers, and insurance verifiers to cross-reference claims and enrollments.
Medicaid
Source: NPPES public registry.
Medicare enrollment
This provider holds a Medicare enrollment on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20120202000899Internal MedicineIN
Source: CMS PECOS public enrollment file.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. Mark Williams MD accepts. To confirm in-network status with your specific health plan, contact Dr. Mark Williams MD directly at (317) 962-5820.
Frequently asked
Yes. NPI 1659461564 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Pulmonary Disease Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (317) 962-5820.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. Mark Williams MD is a Type-1 individual NPI.