Anna Elizabeth Willis , PA-C
Physician Assistant • Centennial, CO
9110 E Nichols Ave Ste 150
Centennial, CO 801123450
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on September 19, 2012; this date does not establish years in practice.
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Published CMS data list 1,001 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- G2211 — Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's: 207 service units.
- 51798 — Ultrasound measurement of bladder capacity after voiding: 152 service units.
- 99213 — Established patient outpatient office visit: 150 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 12 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 1,015 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Tamsulosin Hcl — 240 prescription fills, including refills.
- Finasteride — 136 prescription fills, including refills.
- Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) — 79 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 20 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 70% of clinicians listed under Physician Assistant in Centennial, CO (2024, 15 clinicians with data). Median for this group: 192. Middle half: 134 to 1,341.
More Medicare Part B services than 85% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: 195. Middle half: 69 to 517.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 138 in 2020 to 1,001 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
9110 E Nichols Ave Ste 150
Centennial, CO 801123450
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
340 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $41,037 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
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 – by Provider and Service, 2024.
Paid by Medicare
About $30,212 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
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 – by Provider and Service, 2024.
30-day fills
1,980 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
$82,140 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
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 – by Provider and Drug, 2024.
Open Payments general payments, program year 2024
All general payments: $440.44 across 10 records.
By nature of payment
- Food and Beverage: $372.44 across 9 records.
- Education: $68.00 across 1 record.
Reporting-company totals (3 largest of 7)
- Janssen Pharmaceuticals, Inc: $180.47 across 3 records.
- Dendreon Pharmaceuticals LLC: $145.45 across 1 record.
- Tolmar, Inc.: $30.26 across 2 records.
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.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2024 (published June 30, 2026).
NPI first issued
2012
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, “Does your provider accept Medicare as full payment?”
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.
Compared with the same specialty in Centennial and Colorado
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 70% of clinicians listed under Physician Assistant in Centennial, CO (2024, 15 clinicians with data). Median for this group: 192. Middle half: 134 to 1,341.
More Medicare Part B services than 85% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: 195. Middle half: 69 to 517.
Medicare-allowed amount
A higher Medicare-allowed amount than 70% of clinicians listed under Physician Assistant in Centennial, CO (2024, 15 clinicians with data). Median for this group: $15,489. Middle half: $10,374 to $58,075.
A higher Medicare-allowed amount than 75% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: $15,616. Middle half: $6,273 to $34,912.
Paid by Medicare
A higher Medicare payment amount than 70% of clinicians listed under Physician Assistant in Centennial, CO (2024, 15 clinicians with data). Median for this group: $10,413. Middle half: $7,781 to $41,036.
A higher Medicare payment amount than 80% of clinicians listed under Physician Assistant in Colorado (2024, 1,641 clinicians with data). Median for this group: $11,339. Middle half: $4,686 to $25,550.
Medicare Part D prescriptions
More Part D prescriptions than 80% of clinicians listed under Physician Assistant in Centennial, CO (2024, 23 clinicians with data). Median for this group: 266. Middle half: 141 to 517.
More Part D prescriptions than 80% 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 60% of clinicians listed under Physician Assistant in Centennial, CO (2024, 23 clinicians with data). Median for this group: $38,022. Middle half: $1,824 to $141,451.
A higher Part D drug cost than 75% 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.
59 active clinicians are listed under Physician Assistant with a practice address in Centennial, CO (3,767 in Colorado).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Centennial
13.6% of these 59 clinicians have the CMS telehealth indicator.
35.6% of these 59 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 625% from 138 in 2020 to 1,001 in 2024.
- 2020: 138
- 2021: 725
- 2022: 523
- 2023: 878
- 2024: 1,001
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Medicare-allowed amount
Medicare-allowed amount increased 841% from $4,363 in 2020 to $41,037 in 2024.
- 2020: $4,363
- 2021: $29,692
- 2022: $24,714
- 2023: $37,304
- 2024: $41,037
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Paid by Medicare
Paid by Medicare increased 1220% from $2,289 in 2020 to $30,212 in 2024.
- 2020: $2,289
- 2021: $23,388
- 2022: $16,081
- 2023: $28,026
- 2024: $30,212
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 534% from 160 in 2020 to 1,015 in 2024.
- 2020: 160
- 2021: 270
- 2022: 362
- 2023: 595
- 2024: 1,015
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30-day fills
30-day fills increased 505% from 327 in 2020 to 1,980 in 2024.
- 2020: 327
- 2021: 458
- 2022: 699
- 2023: 1,098
- 2024: 1,980
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Part D drug cost
Part D drug cost increased 2042% from $3,834 in 2020 to $82,140 in 2024.
- 2020: $3,834
- 2021: $6,571
- 2022: $346,289
- 2023: $51,128
- 2024: $82,140
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $347.01 in 2021 to $440.44 in 2024.
- 2021: $347.01
- 2022: $119.55
- 2023: $398.16
- 2024: $440.44
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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
Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $440.44.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Dendreon Pharmaceuticals LLC |
Food and Beverage
In-kind items and services
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PROVENGE | General | $145.45 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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ERLEADA | General | $100.08 |
| Janssen Pharmaceuticals, Inc |
Education
In-kind items and services
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ERLEADA | General | $68.00 |
| ConvaTec Inc. |
Food and Beverage
In-kind items and services
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— | General | $26.91 |
| Zimmer Biomet Holdings, Inc. |
Food and Beverage
In-kind items and services
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Gel-One Cross-linked Hyaluronate | General | $22.38 |
| ACCORD HEALTHCARE, INC. |
Food and Beverage
In-kind items and services
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CAMCEVI | General | $18.04 |
| PROCEPT BioRobotics Corporation |
Food and Beverage
Cash or cash equivalent
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AQUABEAM SYSTEM | General | $16.93 |
| Tolmar, Inc. |
Food and Beverage
Cash or cash equivalent
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ELIGARD | General | $15.30 |
| Tolmar, Inc. |
Food and Beverage
Cash or cash equivalent
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ELIGARD | General | $14.96 |
| Janssen Pharmaceuticals, Inc |
Food and Beverage
In-kind items and services
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ERLEADA | General | $12.39 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2017–2023 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 – by Provider and Service data, 2018–2024; 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 |
|---|---|---|---|---|
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G2211
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
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207 | 193 | $48.00 | $13.76 |
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51798
Ultrasound measurement of bladder capacity after voiding
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152 | 142 | $33.42 | $11.60 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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150 | 133 | $280.02 | $77.25 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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130 | 129 | $394.95 | $109.13 |
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81003
Automated urinalysis test
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127 | 122 | $4.00 | $2.20 |
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81001
Manual urinalysis test with examination using microscope, automated
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118 | 106 | $6.00 | $3.11 |
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99442
Telephone medical discussion with physician, 11-20 minutes
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38 | 36 | $279.24 | $73.53 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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21 | 21 | $555.54 | $153.34 |
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99443
Telephone medical discussion with physician, 21-30 minutes
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17 | 16 | $394.95 | $101.58 |
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51700
Simple bladder irrigation and/or instillation
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14 | 14 | $243.45 | $65.82 |
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87086
Bacterial colony count, urine
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14 | 14 | $20.00 | $7.91 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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13 | 13 | $345.03 | $94.69 |
Source: CMS Part B by Provider and Service, 2024; 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.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Tamsulosin Hcl | Tamsulosin Hcl | 240 | 17,510 | $3,249.11 | 103 |
| Finasteride | Finasteride | 136 | 12,310 | $2,134.01 | 54 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 79 | 1,099 | $724.73 | 57 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 54 | 1,092 | $358.42 | 39 |
| Testosterone Cypionate | Testosterone Cypionate | 54 | 2,140 | $1,037.08 | 14 |
| Testosterone | Testosterone | 50 | 1,770 | $5,155.65 | — |
| Allopurinol | Allopurinol | 45 | 3,720 | $498.03 | 14 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 45 | 872 | $314.44 | 34 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 44 | 113 | $192.01 | 41 |
| Myrbetriq | Mirabegron | 44 | 1,921 | $29,251.57 | — |
| Alfuzosin Hcl Er | Alfuzosin Hcl | 44 | 3,095 | $918.47 | 21 |
| Oxybutynin Chloride | Oxybutynin Chloride | 37 | 365 | $207.40 | 33 |
| Gemtesa | Vibegron | 34 | 2,060 | $33,372.94 | 12 |
| Potassium Citrate Er | Potassium Citrate | 29 | 1,730 | $2,383.01 | 11 |
| Estradiol | Estradiol | 16 | 911 | $1,256.45 | 13 |
| Tadalafil | Tadalafil | 16 | 1,260 | $573.01 | — |
| Clotrimazole-Betamethasone | Clotrimazole/Betamethasone Dip | 13 | 185 | $131.46 | — |
| Nitrofurantoin Mono-Macro | Nitrofurantoin Monohyd/M-Cryst | 13 | 88 | $177.58 | 11 |
| Cephalexin | Cephalexin | 11 | 520 | $169.04 | — |
| Hydrochlorothiazide | Hydrochlorothiazide | 11 | 750 | $35.42 | — |
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: 2026-07-29NUCC Taxonomy Code: 363A00000X
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.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Urology
Doctor of Medicine (M.D.)
Urology
Doctor of Medicine (M.D.), Master of Business Administration
Urology
Doctor of Medicine (M.D.)
Psychiatry & Neurology - Addiction Medicine
Certified Nurse Practitioner
Physician Assistant
Physician Assistant (Certified)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 6400 S FIDDLERS GREEN CIR STE 300, GREENWOOD VILLAGE, CO 801114955 (Tel: 8885384185)
Registered at 9110 E NICHOLS AVE STE 150, CENTENNIAL, CO 801123450 (Tel: 7206664739)
Registered at 9110 E NICHOLS AVE STE 150, CENTENNIAL, CO 801123450 (Tel: 7206664739)
Registered at 10450 PARK MEADOWS DR STE 202, LONE TREE, CO 801245528 (Tel: 3037338848)
Registered at 10450 PARK MEADOWS DR STE 202, LONE TREE, CO 801245528 (Tel: 3037338848)
NPI status registered as active in NPPES database
Registered at 799 E HAMPDEN AVE, SUITE 430, ENGLEWOOD, CO 801132700 (Tel: 3037338848)
Registered at 799 E HAMPDEN AVE, SUITE 430, ENGLEWOOD, CO 801132700 (Tel: 3037338848)
Recorded as ANNA WILLIS, PA-C
Physician Assistant (license number reported to NPPES: CO 0003482)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Centennial
- Rachel Benton, PA-C
- Heidi Gillespie, PA-C
- Kirsten Daly
- Carly Baltare, PA
- Danielle Donlan, PA-C
- Daniel Martin, PA-C
Mailing Address
6400 S Fiddlers Green Cir Ste 300
Greenwood Village, CO 801114955
Phone: 8885384185