Medicare Enrolled
Dr. Warren Fields, M.D.
Critical Care Medicine · Royal Oak, MI
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Fields from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
Are you Dr. Fields?
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What this data tells you about Dr. Fields
Dr. Warren Fields is a critical care medicine specialist in Royal Oak, MI, with 19 years of NPI registration. Based on federal Medicare data, Dr. Fields performed 2,829 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Fields received a total of $9,708 from 41 pharmaceutical and/or device companies across 556 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Fields is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 19 years of NPI registration
▲ Top 7% volume in MI
$9,708 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗2,829
Medicare services
Top 7% in MI for critical care medicine
Not available
Unique patients (not deduplicated)
$76
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
792 | $63 | $117 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
447 | $93 | $144 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
391 | $95 | $153 |
| Pulmonary gas exchange test A test to examine how well the lungs exchange gases. |
238 | $44 | $109 |
| Lung volume test using gas dilution or washout A test that measures the amount of air in your lungs by using a gas dilution or washout method. |
224 | $34 | $79 |
| Spirometry test before and after medication A test that measures the amount of air you can exhale and the speed of your breathing before and after taking a medication. |
215 | $30 | $108 |
| Initial hospital admission, high complexity Initial hospital inpatient or observation care for a new patient involving high-level medical decision making, with at least 75 minutes total time on the date of the encounter. |
196 | $139 | $269 |
| Critical care, first 30-74 min Emergency medical care for a critically ill or injured patient lasting between 30 and 74 minutes. This service involves direct patient care and medical decision making to stabilize the patient. |
80 | $170 | $646 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
72 | $67 | $115 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
58 | $131 | $200 |
| Expiratory airflow and volume test A test that measures the amount of air you can exhale and the speed at which you can breathe it out. It evaluates lung function by assessing expiratory airflow and volume. |
48 | $19 | $68 |
| New patient office visit, complex (60-74 min) | 32 | $141 | $275 |
| Chest fluid aspiration with imaging guidance This procedure involves removing fluid from the chest cavity using imaging technology to guide the needle placement. |
21 | $89 | $271 |
| Bronchial irrigation and suction for cell collection This procedure uses an endoscope to flush and suction the lung airways in order to collect cells for testing. |
15 | $105 | $333 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
Industry Payment Transparency
Open Payments through 2024 ↗$9,708
Total received (2018-2024)
Avg $1,387/year across 7 years
Top 17% in MI for critical care medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
41
Companies
556
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,349
2023
$1,849
2022
$1,868
2021
$1,260
2020
$934
2019
$1,414
2018
$1,035
Payments by company (2024)
AstraZeneca Pharmaceuticals LP
$300
GlaxoSmithKline, LLC.
$250
Boehringer Ingelheim Pharmaceuticals, Inc.
$129
Actelion Pharmaceuticals US, Inc.
$108
United Therapeutics Corporation
$75
Regeneron Healthcare Solutions, Inc.
$70
Mylan Specialty L.P.
$68
GENZYME CORPORATION
$58
Baxter Healthcare
$48
Takeda Pharmaceuticals U.S.A., Inc.
$45
Grifols USA, LLC
$42
Resmed Corp
$37
ANI Pharmaceuticals, Inc.
$26
Avadel CNS Pharmaceuticals, LLC
$24
Philips North America LLC
$20
Merck Sharp & Dohme LLC
$19
Hikma Pharmaceuticals USA
$16
Insmed, Inc.
$13
Top 3 companies account for 50.3% of 2024 payments
All-time payments by company (2018-2024) ›
GlaxoSmithKline, LLC.
$2,287
AstraZeneca Pharmaceuticals LP
$1,947
Boehringer Ingelheim Pharmaceuticals, Inc.
$1,202
Grifols USA, LLC
$507
Actelion Pharmaceuticals US, Inc.
$463
Mylan Specialty L.P.
$414
Regeneron Healthcare Solutions, Inc.
$389
Takeda Pharmaceuticals U.S.A., Inc.
$278
GENZYME CORPORATION
$234
United Therapeutics Corporation
$156
Inogen, Inc.
$149
Insmed, Inc.
$143
Baxter Healthcare
$138
Circassia Pharmaceuticals Inc
$130
Philips Electronics North America Corporation
$129
Advanced Respiratory, Inc
$106
Electromed, Inc.
$104
Pulmonx Corporation
$102
Sunovion Pharmaceuticals Inc.
$94
Mallinckrodt Enterprises LLC
$69
Novartis Pharmaceuticals Corporation
$63
Gilead Sciences, Inc.
$59
Teva Pharmaceuticals USA, Inc.
$52
La Jolla Pharmaceutical Company
$48
Mallinckrodt Hospital Products Inc.
$45
Tactile Systems Technology Inc
$43
Resmed Corp
$37
Merck Sharp & Dohme LLC
$32
Genentech USA, Inc.
$31
Merck Sharp & Dohme Corporation
$27
ANI Pharmaceuticals, Inc.
$26
Axsome Therapeutics, Inc.
$25
Avadel CNS Pharmaceuticals, LLC
$24
PFIZER INC.
$22
Janssen Pharmaceuticals, Inc
$20
Harmony Biosciences LLC
$20
Philips North America LLC
$20
MAYNE PHARMA INC.
$19
Astellas Pharma US Inc
$18
ADVANCED RESPIRATORY, INC
$16
Hikma Pharmaceuticals USA
$16
Top 3 companies account for 56.0% of all-time payments
Associated products mentioned in payments ›
(7999) SRC Und · (8874) inCourage · ACTHAR · AIRSENSE · AIRSUPRA · ANORO · ANORO ELLIPTA · AREXVY · Arikayce · BEVESPI AEROSPHERE · BREO · BREO ELLIPTA · BREZTRI · CHARTIS CATHETER · CINQAIR · Cresemba · DUAKLIR PRESSAIR · DUPIXENT · Esbriet · FASENRA · Flexitouch Plus · GIAPREZA · GLASSIA · Hillrom - Life 2000 Ventilation System · Hillrom - Vest System Model 105 Home Care · INOGEN · INOGEN ONE G5 OXYGEN CONCENTRATOR - BLUETOOTH · InogenOne · JARDIANCE · LONHALA MAGNAIR · LUMRYZ · Life 2000 Ventilation System · NUCALA · OFEV · OPSUMIT · PANZYGA · PURIFIED CORTROPHIN GEL · Prolastin-C · Prolastin-C Liquid · Respiratoriy Care Undiv · Ryaltris · SMARTVEST · SPIRIVA RESPIMAT · STIOLTO · STIOLTO RESPIMAT · SYMBICORT · Sunosi · TEZSPIRE · TRELEGY ELLIPTA · TUDORZA PRESSAIR · TYVASO · The Vest System Model 105 Home Care · UPTRAVI · Utibron · Wakix · XARELTO · XOLAIR · Xolair · YUPELRI · Yupelri · inCourage
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Critical care medicines in nearby ZIP areas
86
County median income
$95,296
Nearest hospital to ZIP centroid (approximate)
BEAUMONT HOSPITAL ROYAL OAK
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Fields is a clinical cardiology specialist, with above-average Medicare volume (top 7% in MI), with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Fields experienced with hospital follow-up visit, moderate complexity?
Based on Medicare claims data, Dr. Fields performed 792 hospital follow-up visit, moderate complexity services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Fields receive payments from pharmaceutical companies?
Yes. Dr. Fields received a total of $9,708 from 41 companies across 556 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Fields's costs compare to other critical care medicines in Royal Oak?
Dr. Fields's average Medicare payment per service is $76. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Fields) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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