MICHAEL ANTHONY WILLIAMS MD
NPI 1598738031
Internal Medicine in Denver, CO

Q: What is Michael Williams's NPI number?

The NPI number for Michael Williams is 1598738031. It was assigned to this individual provider in the NPPES registry on February 7, 2006.

Q: What is Michael Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Michael Williams was last updated on September 12, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years 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 February 07, 2006PECOS Enrolled

77.17/100

CMS Quality Rating

2525 S DOWNING ST, PORTER PRE-SURGICAL EVALUATION, DENVER, CO 80210(303) 765-6892 Get Directions Write a Review

NPPES record last updated: September 12, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Michael Anthony Williams Md NPPES

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

MICHAEL ANTHONY WILLIAMS MD (NPI 1598738031) is an individual internal medicine provider in Denver, Colorado, licensed in Colorado (37014) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1598738031

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameMICHAEL ANTHONY WILLIAMSCredential: MD

Location Address2525 S DOWNING ST, PORTER PRE-SURGICAL EVALUATIONDenver, CO 80210-5817

Mailing Address2525 S Downing St, Porter Pre-surgical EvaluationDenver, CO 80210-5817 · (303) 765-6892

Phone(303) 765-6892

Sole ProprietorNo

Enumeration DateFebruary 7, 2006

Last NPPES UpdateSeptember 12, 2011

✔ NPI 1598738031 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in CO · 37014

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

2525 S DOWNING ST, Denver, CO 80210

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michael Anthony Williams Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignment

Medicare enrollment records show Michael Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Portercare Adventist Health System

Same address

Cardiovascular Disease

2525 S DOWNING ST
Denver, CO 80210

Reassigned Medicare billing, Colorado enrollment
733 clinicians in this Medicare group

NPI 1194680702 (303) 765-6893

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80210 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

$132.55 typical visit price

range $58.06 – $174.82

Typical copayment $33.13 (range $14.51 – $43.70)

Most-billed visit code 99204

Established Patient

$102.03 typical visit price

range $18.88 – $142.79

Typical copayment $25.50 (range $4.72 – $35.69)

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.

77.17/100

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

Scored as part of a group practice

Quality

80.27

Promoting Interoperability

Improvement Activities

Cost

59.47

Other Providers at the Same Location NPPES 20

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

ANDREA LACINA

General Acute Care Hospital

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 778-5811

SARA A. SCHAECHER NP

Nurse Practitioner (Adult Health)

2525 S DOWNING ST, INTENSIVE CARE UNIT
DENVER, CO 80210

Denver County (303) 778-2571

MOUNTAIN STATES PATHOLOGY PC

Pathology (Anatomic Pathology & Clinical Pathology)

2525 S DOWNING ST
DENVER, CO 80210

Denver County (719) 776-5816

MRS. ANGELA KAY MALINOSKI

Registered Nurse (General Practice)

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 765-6947

PAYAM KHALIGHI DO

Hospitalist

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 715-7184

DAVID M CLAMPITT MD

Family Medicine

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 715-7184

PORTERCARE ADVENTIST HEALTH SYSTEM

Registered Nurse (Neonatal Intensive Care)

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 778-1955

OBSTETRIX MEDICAL GROUP OF COLORADO, P.C.

Pediatrics (Pediatric Cardiology)

2525 S DOWNING ST
DENVER, CO 80210

Denver County (303) 778-1955

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 Michael Williams's NPI number?

The NPI number for Michael Williams is 1598738031. It was assigned to this individual provider in the NPPES registry on February 7, 2006.

Where is Michael Williams located?

Michael Williams practices at 2525 S Downing St Porter Pre-Surgical Evaluation, Denver, CO 80210. The listed phone number is (303) 765-6892.

What is Michael Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Michael Williams enrolled in Medicare?

Yes. Michael Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Williams reassigns Medicare benefits to Portercare Adventist Health System (Denver, CO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Williams was last updated on September 12, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years 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.