Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Stacy A Willis , PA-C

Physician Assistant โ€ข Denver, CO

Active NPI 1740418110 Individual Practitioner Female Practitioner Accepts Medicare assignment
Practice location in NPPES

1375 E 20th Ave
Denver, CO 802055422

Call 3033384545 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

1375 E 20th Ave

Denver, CO 802055422

Telephone 3033384545
Organization at the Same NPPES Address or Phone
Kaiser Foundation Health Plan Of Colorado Facility NPI 1629186333

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Colorado Permanente Medical Group Pc. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Graduation Year

2009

Medicare-allowed amount

About $819 in 2019

The total amount Medicare approved for these services in 2019. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2019.

Paid by Medicare

About $402 in 2019

The part of the Medicare-allowed amount that Medicare itself paid in 2019, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2019.

30-day fills

658 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$13,795 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers โ€“ by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $61.57 across 3 records.

By nature of payment

  • Food and Beverage: $61.57 across 3 records.

Reporting-company totals

  • Astellas Pharma US Inc: $46.27 across 2 records.
  • Bayer Healthcare Pharmaceuticals Inc.: $15.30 across 1 record.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

17 years (graduated 2009)

CMS Doctors and Clinicians data list 2009 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2009

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Stacy Willis has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Stacy Willis as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Denver and Colorado

Billing and prescribing volume is not a quality rating.

Medicare Part D prescriptions

More Part D prescriptions than 80% of clinicians listed under Physician Assistant in Denver, CO (2024, 279 clinicians with data). Median for this group: 133. Middle half: 41 to 342.

More Part D prescriptions than 70% of clinicians listed under Physician Assistant in Colorado (2024, 2,034 clinicians with data). Median for this group: 194. Middle half: 63 to 625.

Part D drug cost

A higher Part D drug cost than 65% of clinicians listed under Physician Assistant in Denver, CO (2024, 279 clinicians with data). Median for this group: $2,214. Middle half: $367 to $35,943.

A higher Part D drug cost than 60% of clinicians listed under Physician Assistant in Colorado (2024, 2,034 clinicians with data). Median for this group: $3,374. Middle half: $574 to $55,951.

Medicare Part B

Comparisons use 2024 data. The latest CMS data for Stacy Willis are from 2019.

540 active clinicians are listed under Physician Assistant with a practice address in Denver, CO (3,767 in Colorado).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Denver

11.9% of these 540 clinicians have the CMS telehealth indicator.

54.1% of these 540 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Physician & Other Practitioners (2019), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2025

Program year 2025 (payments made January 1 โ€“ December 31, 2025): fewer than 11 records totaling $61.57.

Manufacturer Payment Nature Product Type Amount ($)
Astellas Pharma US Inc
Food and Beverage
In-kind items and services
Veozah General $24.63
Astellas Pharma US Inc
Food and Beverage
In-kind items and services
Veozah General $21.64
Bayer Healthcare Pharmaceuticals Inc.
Food and Beverage
In-kind items and services
Lynkuet General $15.30

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2019.

CMS Part B ยท Data Year 2019

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2018 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2019; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
99213 Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
14 12 $137.27 $58.50

Source: CMS Part B by Provider and Service, 2019; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D ยท Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Fluorouracil Fluorouracil 155 4,067 $5,895.77 150
Clobetasol Propionate Clobetasol Propionate 112 2,935 $2,178.86 62
Triamcinolone Acetonide Triamcinolone Acetonide 70 1,909 $1,009.94 55
Ketoconazole Ketoconazole 69 1,980 $996.39 38
Retin-A Tretinoin 28 782 $853.64 15
Metronidazole Metronidazole 23 835 $411.73 19
Tacrolimus Tacrolimus 21 569 $884.94 13
Atorvastatin Calcium Atorvastatin Calcium 20 1,650 $231.63 โ€”
Lisinopril Lisinopril 15 1,350 $165.00 โ€”
Clindamycin Phosphate Clindamycin Phosphate 15 450 $356.35 โ€”
Doxycycline Monohydrate Doxycycline Monohydrate 15 658 $491.23 11
Doxycycline Hyclate Doxycycline Hyclate 13 845 $319.81 โ€”

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2021-06-21
Physician Assistant Primary Specialty

NUCC Taxonomy Code: 363A00000X

License # reported to NPPES CO 0004027

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Physician Assistant

NUCC Taxonomy Code: 363A00000X

License # reported to NPPES WY TL529

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Physician Assistant

NUCC Taxonomy Code: 363A00000X

License # reported to NPPES ME PA001171

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Colorado Division of Professions and Occupations.
Look Up on State Board Site

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid ID
55381031 (CO)
Other Identifier Kaiser Commercial Number
025301 (CO)

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - PHYSICIAN ASSISTANT

Medicare Enrollment ID

I20141126001134

Enrollment State Jurisdiction

CO

PECOS Control ID

6305990961

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Colorado Permanente Medical Group Pc

1375 E 20th Ave, Denver, CO 802055422

Phone: 3033384545

Colorado Permanente Medical Group Pc

10350 E Dakota Avenue C, Denver, CO 802471314

Phone: 3033384545

Colorado Permanente Medical Group Pc

10350 E Dakota Avenue B, Denver, CO 802471314

Phone: 3033384545

Colorado Permanente Medical Group Pc

10350 E Dakota Ave, Denver, CO 802471314

Colorado Permanente Medical Group Pc

10350 E Dakota Ave, Denver, CO 802471314

Phone: 3033384545

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

26 listed
Dr. Robert Burman , MD, PhD

Radiology - Diagnostic Radiology

NPI 1003013830

Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)

Dr. Michelle Chen , MD

Internal Medicine

NPI 1003375908

Doctor of Medicine (M.D.)

Suzanne Ehler , FNP

Nurse Practitioner - Family

NPI 1003205295

Family Nurse Practitioner

Dr. Barry Eskins , MD

Internal Medicine - Hospice and Palliative Medicine

NPI 1013035971

Doctor of Medicine (M.D.)

Kristy Faulkner , NP

Nurse Practitioner - Family

NPI 1003177247

Nurse Practitioner

Sara Flanigan

Physician Assistant - Medical

NPI 1003171612

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

9 Historical Events
๐Ÿ“
Updated Business Mailing Address June 21, 2021

Registered at 10350 E DAKOTA AVE, DENVER, CO 802471314

๐Ÿ“
Updated Business Mailing Address December 04, 2019

Registered at 2500 S HAVANA ST, AURORA, CO 800141618 (Tel: 3033384545)

๐Ÿ‘ค
Provider Name / Credentials Updated December 04, 2019

Recorded as STACY WILLIS, PA-C

โœ…
NPI Profile Active December 11, 2014

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) December 11, 2014

Registered at 1375 E 20TH AVE, DENVER, CO 802055422 (Tel: 3033384545)

๐Ÿ“
Business Mailing Address (Initial Record) December 11, 2014

Registered at 1375 E 20TH AVE, DENVER, CO 802055422 (Tel: 3033384545)

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) December 11, 2014

Recorded as STACY WILLIAMS, PA-C

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) December 11, 2014

Physician Assistant (license number reported to NPPES: CO 0004027)

๐ŸŸข
Initial NPI Registration & Enumeration June 24, 2009

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1740418110
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: June 24, 2009
Last Update: June 21, 2021
Sole Proprietor: No

Other Physician Assistants in Denver

All Physician Assistants in Denver

Mailing Address

10350 E Dakota Ave

Denver, CO 802471314

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.