Dr. Ann Marie Mauer , MD
Specialist • Chicago, IL
Center For Advanced Care, 900 West Nelson St
Chicago, IL 60657
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 August 8, 2006; this date does not establish years in practice.
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Published CMS data list 404 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:
- 99214 — Established patient outpatient office visit: 121 service units.
- 99215 — Established patient outpatient office visit: 119 service units.
- 99213 — Established patient outpatient office visit: 80 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 6 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 633 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:
- Anastrozole — 391 prescription fills, including refills.
- Tamoxifen Citrate — 76 prescription fills, including refills.
- Letrozole — 41 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 10 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Specialist in Chicago, IL (2024, 15 clinicians with data). Median for this group: 404. Middle half: 189 to 673.
Fewer Medicare Part B services than 65% of clinicians listed under Specialist in Illinois (2024, 124 clinicians with data). Median for this group: 845. Middle half: 325 to 2,816.
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 427 in 2020 to 404 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
Center For Advanced Care
900 West Nelson St
Chicago, IL 60657
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
184 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 $42,963 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 $32,536 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
1,622 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
$12,613 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.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $79.00 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
NPI first issued
2006
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.
Enrolled in Medicare (PECOS)
Dr. Mauer 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.
Can order Medicare-covered services
CMS lists Dr. Mauer 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.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
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.
Compared with the same specialty in Chicago and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Specialist in Chicago, IL (2024, 15 clinicians with data). Median for this group: 404. Middle half: 189 to 673.
Fewer Medicare Part B services than 65% of clinicians listed under Specialist in Illinois (2024, 124 clinicians with data). Median for this group: 845. Middle half: 325 to 2,816.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Specialist in Chicago, IL (2024, 15 clinicians with data). Median for this group: $28,557. Middle half: $15,369 to $51,692.
A lower Medicare-allowed amount than 65% of clinicians listed under Specialist in Illinois (2024, 124 clinicians with data). Median for this group: $82,929. Middle half: $28,554 to $241,062.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Specialist in Chicago, IL (2024, 15 clinicians with data). Median for this group: $21,515. Middle half: $11,641 to $39,629.
A lower Medicare payment amount than 65% of clinicians listed under Specialist in Illinois (2024, 124 clinicians with data). Median for this group: $60,992. Middle half: $20,643 to $182,426.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Specialist in Chicago, IL (2024, 18 clinicians with data). Median for this group: 312. Middle half: 94 to 803.
Close to the middle for clinicians listed under Specialist in Illinois (2024, 127 clinicians with data). Median for this group: 468. Middle half: 69 to 1,831.
Part D drug cost
Close to the middle for clinicians listed under Specialist in Chicago, IL (2024, 18 clinicians with data). Median for this group: $14,933. Middle half: $5,622 to $86,149.
Close to the middle for clinicians listed under Specialist in Illinois (2024, 127 clinicians with data). Median for this group: $22,661. Middle half: $2,200 to $193,901.
231 active clinicians are listed under Specialist with a practice address in Chicago, IL (1,157 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
2.2% of these 231 clinicians have the CMS telehealth indicator.
6.5% of these 231 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 stayed about the same: 427 in 2020 and 404 in 2024.
- 2020: 427
- 2021: 429
- 2022: 456
- 2023: 449
- 2024: 404
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Medicare-allowed amount
Medicare-allowed amount varied from year to year: $39,287 in 2020 and $42,963 in 2024.
- 2020: $39,287
- 2021: $49,204
- 2022: $49,186
- 2023: $47,560
- 2024: $42,963
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Paid by Medicare
Paid by Medicare increased 14% from $28,631 in 2020 to $32,536 in 2024.
- 2020: $28,631
- 2021: $36,248
- 2022: $35,738
- 2023: $35,279
- 2024: $32,536
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Medicare Part D prescriptions
Medicare Part D prescriptions varied from year to year: 586 in 2020 and 633 in 2024.
- 2020: 586
- 2021: 578
- 2022: 749
- 2023: 766
- 2024: 633
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30-day fills
30-day fills increased 14% from 1,419 in 2020 to 1,622 in 2024.
- 2020: 1,419
- 2021: 1,530
- 2022: 1,873
- 2023: 1,933
- 2024: 1,622
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Part D drug cost
Part D drug cost decreased 93% from $192,628 in 2020 to $12,613 in 2024.
- 2020: $192,628
- 2021: $37,086
- 2022: $40,127
- 2023: $26,315
- 2024: $12,613
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 94% from $1,373.38 in 2019 to $79.00 in 2025.
- 2019: $1,373.38
- 2020: $34.74
- 2021: $11.92
- 2025: $79.00
Sources: CMS Medicare Physician & Other Practitioners (2024), 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 · 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 2025 (payments made January 1 – December 31, 2025): fewer than 11 records totaling $79.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Ipsen Biopharmaceuticals, Inc |
Education
In-kind items and services
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— | General | $79.00 |
Source: CMS Open Payments, program year 2025, 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 2016–2023 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, 2017–2024; 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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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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121 | 72 | $279.00 | $99.42 |
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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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119 | 34 | $394.00 | $145.50 |
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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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80 | 70 | $198.00 | $67.05 |
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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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43 | 18 | $35.00 | $16.00 |
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99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
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23 | 23 | $489.00 | $189.59 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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18 | 17 | $459.00 | $178.14 |
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 |
|---|---|---|---|---|---|
| Anastrozole | Anastrozole | 391 | 33,937 | $7,652.67 | 129 |
| Tamoxifen Citrate | Tamoxifen Citrate | 76 | 5,968 | $1,735.87 | 26 |
| Letrozole | Letrozole | 41 | 3,240 | $587.14 | 16 |
| Prochlorperazine Maleate | Prochlorperazine Maleate | 27 | 259 | $201.53 | 16 |
| Alendronate Sodium | Alendronate Sodium | 21 | 1,596 | $180.10 | — |
| Exemestane | Exemestane | 18 | 1,248 | $1,342.74 | — |
| Prednisone | Prednisone | 17 | 352 | $33.17 | — |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 16 | 465 | $324.13 | — |
| Dexamethasone | Dexamethasone | 14 | 182 | $398.84 | — |
| Ondansetron Odt | Ondansetron | 12 | 100 | $157.13 | — |
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: 2021-12-17NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - HEMATOLOGY/ONCOLOGY
I20060504000433
IL
6103836143
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physician Assistant - Medical
Physician Assistant
Internal Medicine - Hematology & Oncology
Physician Assistant
Physician Assistant (Certified)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Obstetrics & Gynecology - Gynecologic Oncology
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at CENTER FOR ADVANCED CARE, 900 WEST NELSON ST, CHICAGO, IL 60657 (Tel: 7732967089)
Registered at CRETICOS CANCER CENTER, 900 WEST NELSON ST, CHICAGO, IL 60657 (Tel: 7732967089)
Specialist (license number reported to NPPES: IL 036-090420)
NPI status registered as active in NPPES database
Registered at 901 W WELLINGTON AVE, CHICAGO, IL 606576708 (Tel: 7732967089)
Registered at 5841 S MARYLAND AVE # 2115, CHICAGO, IL 606371447 (Tel: 7732967089)
Recorded as ANN MAUER, M.D.
Specialist
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Specialists in Chicago
- Dr. Matthew Mills, MD
- Dr. Bruce Bissonnette, MD
- Kelly Dineen
- Dr. Lisa Mazzullo, MD
- Dr. Robert Kelsey, MD
- Dr. Salvador Yunez, MD
Mailing Address
Creticos Cancer Center, 900 West Nelson St
Chicago, IL 60657
Phone: 7732967089