Medicare Enrolled
Dr. John Fiedler, M.D.
Internal Medicine · Elgin, IL
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
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. Fiedler 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 →
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What this data tells you about Dr. Fiedler
Dr. John Fiedler is an internal medicine specialist in Elgin, IL, with 20 years of NPI registration. Based on federal Medicare data, Dr. Fiedler performed 11,634 Medicare services across 5,566 unique beneficiaries.
Between the years covered by Open Payments, Dr. Fiedler received a total of $8,314 from 45 pharmaceutical and/or device companies across 439 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in internal medicine. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Fiedler 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.
✓ 20 years in practice
▲ Top 1% volume in IL
$8,314 industry payments
Medicare Practice Summary
Medicare Utilization ↗11,634
Medicare services
Top 1% in IL for internal medicine
5,566
Unique beneficiaries
$27
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~582 Medicare services per year of practice
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 |
|---|---|---|---|
| Denosumab injection (Prolia/Xgeva) | 3,420 | $18 | $27 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
969 | $8 | $20 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
754 | $10 | $55 |
| Hemoglobin A1c test (diabetes monitoring) A blood test that measures your average blood sugar levels over the past two to three months. |
696 | $9 | $50 |
| 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. |
629 | $83 | $229 |
| Lipid panel (cholesterol and triglycerides) A blood test that measures cholesterol and triglyceride levels. |
524 | $13 | $69 |
| Free thyroxine (T4) test A blood test that measures the level of free thyroxine, a thyroid hormone, in the bloodstream. |
485 | $9 | $46 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
481 | $16 | $86 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
457 | $8 | $40 |
| Vitamin D level test A blood test to measure the amount of Vitamin D-3 in your body. |
433 | $29 | $152 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
360 | $15 | $77 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
358 | $126 | $307 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
348 | $14 | $77 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
263 | $133 | $229 |
| Magnesium level test A blood test to measure the amount of magnesium in your body. This helps check for magnesium deficiency or excess. |
260 | $7 | $34 |
| Prothrombin time test (blood clotting) A laboratory test that measures how long it takes for blood to clot. This procedure evaluates the body's coagulation process. |
126 | $4 | $20 |
| Creatinine test (kidney function) A blood test that measures the amount of creatinine to assess kidney function or detect muscle injury. |
117 | $5 | $27 |
| Urine microalbumin test (kidney screening) A laboratory test that measures the amount of microalbumin, a small protein, in a urine sample. This test is used to detect early signs of kidney damage. |
116 | $6 | $30 |
| Flu vaccine, quadrivalent A flu shot containing four strains of the influenza virus to help prevent seasonal influenza infection. |
103 | $75 | $103 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
103 | $32 | $55 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
68 | $10 | $62 |
| Electrocardiogram (EKG), 12-lead A standard heart rhythm test using at least 12 leads to record electrical activity. A healthcare provider interprets the results and provides a written report. |
59 | $11 | $72 |
| PSA test (prostate cancer screening) | 51 | $18 | $94 |
| Basic metabolic blood panel A blood test that measures a group of basic chemicals, including total calcium levels. |
44 | $8 | $44 |
| Transitional care management, high complexity Coordination of care for a patient transitioning from a short-term hospital stay or other facility to home or another care setting. This service addresses a high-complexity medical problem. |
41 | $225 | $496 |
| PSA test (prostate cancer screening) A blood test that measures the level of prostate-specific antigen to screen for prostate cancer. |
40 | $19 | $52 |
| Pneumococcal conjugate vaccine (PCV20) An intramuscular injection of the 20-valent pneumococcal conjugate vaccine. It is used to protect against diseases caused by Streptococcus pneumoniae bacteria. |
34 | $281 | $851 |
| Pneumonia vaccine administration This procedure involves the injection of a vaccine to protect against pneumococcal disease. It is administered by a healthcare provider. |
34 | $32 | $55 |
| Liver function blood test panel | 32 | $8 | $42 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
25 | $13 | $70 |
| Blood potassium level test A blood test that measures the amount of potassium in your body. Potassium is an electrolyte that helps control heart and muscle function. |
25 | $5 | $25 |
| Iron level test | 24 | $6 | $33 |
| Iron binding capacity test A blood test that measures the amount of iron in the blood and the blood's ability to bind and transport iron. |
24 | $9 | $45 |
| Transitional care management services, moderate complexity Services provided to coordinate care during the transition from an inpatient or other facility setting back to the community. This includes follow-up and management of a health problem of at least moderate complexity. |
19 | $160 | $352 |
| Parathyroid hormone level test A blood test that measures the amount of parathyroid hormone in your body. This hormone helps regulate calcium levels in the blood and bones. |
18 | $40 | $212 |
| Annual wellness visit, initial visit A yearly appointment to review your health and create a personalized prevention plan. This initial visit focuses on preventive care and health assessment. |
16 | $171 | $352 |
| 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. |
15 | $47 | $157 |
| Prolactin level test A blood test that measures the amount of prolactin, a hormone produced by the pituitary gland that stimulates milk production, in the body. |
14 | $19 | $100 |
| Total testosterone level test A blood test that measures the total amount of testosterone in your body. This hormone is important for various bodily functions in both men and women. |
13 | $25 | $133 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
13 | $61 | $179 |
| Direct bilirubin level test A blood test that measures the amount of direct bilirubin in your body. Direct bilirubin is the form of the waste product processed by the liver. |
12 | $5 | $25 |
| Prolonged office E/M service, first 15 minutes This code is used for additional time spent by a physician beyond the maximum required time of a primary office or outpatient evaluation and management service. It is billed in 15-minute increments based on total time spent on the date of the primary service. |
11 | $24 | $105 |
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. A higher procedure volume generally indicates more experience with that procedure.
Industry Payment Transparency
Open Payments through 2024 ↗$8,314
Total received (2018-2024)
Avg $1,188/year across 7 years
Top 9% in IL for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
45
Companies
439
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$8,314 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$695
2023
$1,255
2022
$982
2021
$614
2020
$963
2019
$1,632
2018
$2,171
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Amgen Inc.
$110
Janssen Pharmaceuticals, Inc
$86
Bayer Healthcare Pharmaceuticals Inc.
$81
Boehringer Ingelheim Pharmaceuticals, Inc.
$77
Novo Nordisk Inc
$73
GlaxoSmithKline, LLC.
$58
Otsuka America Pharmaceutical, Inc.
$48
Lilly USA, LLC
$32
ABBVIE INC.
$31
Edwards Lifesciences Corporation
$30
PFIZER INC.
$30
Exact Sciences Corporation
$25
Currax Pharmaceuticals LLC
$14
Top 3 companies account for 39.8% of 2024 payments
All-time payments by company (2018-2024) ›
Boehringer Ingelheim Pharmaceuticals, Inc.
$1,467
Amgen Inc.
$774
Novo Nordisk Inc
$749
Janssen Pharmaceuticals, Inc
$733
PFIZER INC.
$665
AstraZeneca Pharmaceuticals LP
$595
Amarin Pharma Inc.
$363
SANOFI-AVENTIS U.S. LLC
$352
Astellas Pharma US Inc
$235
GlaxoSmithKline, LLC.
$226
Lilly USA, LLC
$211
Bayer Healthcare Pharmaceuticals Inc.
$199
Otsuka America Pharmaceutical, Inc.
$170
Regeneron Healthcare Solutions, Inc.
$154
Genentech USA, Inc.
$149
AbbVie, Inc.
$139
ABBVIE INC.
$105
E.R. Squibb & Sons, L.L.C.
$92
Abbott Laboratories
$87
Exact Sciences Corporation
$72
Mylan Specialty L.P.
$63
Novartis Pharmaceuticals Corporation
$61
Circassia Pharmaceuticals Inc
$53
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$48
Merck Sharp & Dohme Corporation
$47
JAZZ PHARMACEUTICALS INC.
$45
Corium, LLC
$44
Philips Electronics North America Corporation
$42
Takeda Pharmaceuticals U.S.A., Inc.
$40
ARBOR PHARMACEUTICALS, INC.
$37
Edwards Lifesciences Corporation
$30
Allergan Inc.
$28
AbbVie Inc.
$27
Boston Scientific Corporation
$22
Ironwood Pharmaceuticals, Inc
$22
SANOFI PASTEUR INC.
$21
Kowa Pharmaceuticals America, Inc.
$20
IBSA Pharma Inc.
$19
Sanofi Pasteur Inc.
$18
Medtronic MiniMed, Inc.
$17
Synergy Pharmaceuticals Inc
$16
Corcept Therapeutics
$15
Currax Pharmaceuticals LLC
$14
Esperion Therapeutics, Inc.
$13
Radius Health, Inc.
$12
Top 3 companies account for 36.0% of all-time payments
Associated products mentioned in payments ›
ADVAIR · ANORO · Adlarity · Aimovig · BREZTRI · BYDUREON · BYSTOLIC · CHANTIX · CUVITRU · CardioMEMS HF System · Cologuard Collection Kit · Creon · DUZALLO · Dymista · EDWARDS SAPIEN 3 TRANSCATHETER HEART VALVE (THV) · ELIQUIS · EMGALITY · ENTRESTO · EVENITY · Edarbi · Edarbyclor · FARXIGA · FLUZONE HIGH-DOSE · FREESTYLE LIBRE 2 · GENERAL PAIN MANAGEMENT · INVOKANA · JANUVIA · JARDIANCE · KRYSTEXXA · Kerendia · Korlym · LYRICA · Livalo · MOUNJARO · MYRBETRIQ · Myrbetriq · NEXLETOL · NURTEC ODT · ONZETRA XSAIL · Otezla · Ozempic · PRADAXA · PRALUENT ALIROCUMAB INJECTION · Perforomist · Proclaim Family of SCS IPGs · Prolia · REXULTI · Repatha · Respiratoriy Care Undiv · Rybelsus · SHINGRIX · SOLIQUA · SOLIQUA 100/33 · SPIRIVA RESPIMAT · SPRAVATO · STIOLTO RESPIMAT · SUNOSI · SYMBICORT · SYNTHROID · Saxenda · Synthroid · TOUJEO · TOVIAZ · TRADJENTA · TRULICITY · TUDORZA PRESSAIR · Tirosint · Tresiba · Trintellix · Trulance · UBRELVY · VIAGRA · VIBERZI · Vascepa · Wegovy · XARELTO · XIFAXAN · Xofluza · Yupelri · ZOSTAVAX · iPro2
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. 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 →
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians. Total industry engagement is in the top 9% for internal medicine in IL.
Geographic Context
Internal medicine physicians within 10 mi
1,582
Per 100K population
306.5
County median income
$100,678
Nearest hospital
ADVOCATE SHERMAN HOSPITAL
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | 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. Fiedler is a mixed practice specialist, with above-average Medicare volume (top 1% in IL), with low-engagement industry engagement in the top 9% of IL peers, with 20 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. Fiedler experienced with denosumab injection (prolia/xgeva)?
Based on Medicare claims data, Dr. Fiedler performed 3,420 denosumab injection (prolia/xgeva) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Fiedler receive payments from pharmaceutical companies?
Yes. Dr. Fiedler received a total of $8,314 from 45 companies across 439 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. 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. Fiedler's costs compare to other internal medicine physicians in Elgin?
Dr. Fiedler's average Medicare payment per service is $27. 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. Fiedler) 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 a long track record of practice, Medicare participation, and industry disclosure. 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?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): 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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