Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Dr. Dennis F. Kellar , MD

Internal Medicine - Pulmonary Disease • Algonquin, IL

Active NPI 1679683866 Individual Practitioner Male Practitioner Accepts Medicare assignment Telehealth (some services)
Practice location in NPPES

1340 Ryan Pkwy
Algonquin, IL 601024527

Call 8154777350 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

1340 Ryan Pkwy

Algonquin, IL 601024527

Telephone 8154777350
Fax 8154777351
Organization at the Same NPPES Address or Phone
Northwest Pulmonary And Sleep Medicine Sc Facility NPI 1881878221

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: Northwest Pulmonary And Sleep Medicine Sc. 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

1997

Medicare patients

977 people with Original Medicare in 2024

Different Original Medicare patients in 2024; counts below 11 are hidden; this does not show availability or quality.

Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.

Medicare-allowed amount

About $373,797 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.

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 $284,532 in 2024

The part of the Medicare-allowed amount that Medicare itself paid in 2024, 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 – by Provider and Service, 2024.

30-day fills

3,515 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

$2,291,478 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 – by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $1,917.93 across 81 records.

By nature of payment

  • Food and Beverage: $1,917.93 across 81 records.

Reporting-company totals (3 largest of 17)

  • AstraZeneca Pharmaceuticals LP: $455.50 across 13 records.
  • Sanofi and Genzyme US Companies: $361.06 across 15 records.
  • GlaxoSmithKline, LLC.: $331.67 across 23 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.

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

29 years (graduated 1997)

CMS Doctors and Clinicians data list 1997 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

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.

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, “Does your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

Telehealth (some services)

Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.

What this does not show: Telehealth (some services)

It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.

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)

Dr. Kellar 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 Dr. Kellar 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 Algonquin and Illinois

Billing and prescribing volume is not a quality rating.

Medicare Part B services

More Medicare Part B services than 95% of clinicians listed under Internal Medicine - Pulmonary Disease in Illinois (2024, 420 clinicians with data). Median for this group: 896. Middle half: 358 to 1,804.

Too few clinicians listed under Internal Medicine - Pulmonary Disease in Algonquin have Medicare Part B data for 2024 to compare.

Medicare-allowed amount

A higher Medicare-allowed amount than 95% of clinicians listed under Internal Medicine - Pulmonary Disease in Illinois (2024, 420 clinicians with data). Median for this group: $92,004. Middle half: $41,661 to $177,106.

Too few clinicians listed under Internal Medicine - Pulmonary Disease in Algonquin have Medicare Part B data for 2024 to compare.

Paid by Medicare

A higher Medicare payment amount than 95% of clinicians listed under Internal Medicine - Pulmonary Disease in Illinois (2024, 420 clinicians with data). Median for this group: $69,928. Middle half: $31,974 to $135,512.

Too few clinicians listed under Internal Medicine - Pulmonary Disease in Algonquin have Medicare Part B data for 2024 to compare.

Medicare Part D prescriptions

More Part D prescriptions than 80% of clinicians listed under Internal Medicine - Pulmonary Disease in Illinois (2024, 406 clinicians with data). Median for this group: 763. Middle half: 184 to 1,610.

Too few clinicians listed under Internal Medicine - Pulmonary Disease in Algonquin have Medicare Part D data for 2024 to compare.

Part D drug cost

A higher Part D drug cost than 90% of clinicians listed under Internal Medicine - Pulmonary Disease in Illinois (2024, 406 clinicians with data). Median for this group: $391,081. Middle half: $53,106 to $979,710.

Too few clinicians listed under Internal Medicine - Pulmonary Disease in Algonquin have Medicare Part D data for 2024 to compare.

2 active clinicians are listed under Internal Medicine - Pulmonary Disease with a practice address in Algonquin, IL (617 in Illinois).

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

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

Open Payments · Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 – December 31, 2025): 81 records totaling $1,917.93.

Manufacturer Payment Nature Product Type Amount ($)
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FASENRA General $120.50
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FASENRA General $116.91
JAZZ PHARMACEUTICALS INC.
Food and Beverage
In-kind items and services
XYWAV General $39.53
Baxter Healthcare
Food and Beverage
In-kind items and services
Hillrom - Vest System Model 105 Home Care General $37.07
Regeneron Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
DUPIXENT General $36.31
Regeneron Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
DUPIXENT General $35.71
Regeneron Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
DUPIXENT General $35.20
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $35.19
Axsome Therapeutics, Inc.
Food and Beverage
In-kind items and services
Sunosi General $34.13
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $33.99
Regeneron Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
DUPIXENT General $33.19
Takeda Pharmaceuticals U.S.A., Inc.
Food and Beverage
In-kind items and services
GLASSIA General $33.01
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $31.79
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $31.64
Axsome Therapeutics, Inc.
Food and Beverage
In-kind items and services
Sunosi General $30.92
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $30.11
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $29.51
Takeda Pharmaceuticals U.S.A., Inc.
Food and Beverage
In-kind items and services
GLASSIA General $29.35
Axsome Therapeutics, Inc.
Food and Beverage
In-kind items and services
Sunosi General $29.21
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $27.98
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $27.98
Sanofi and Genzyme US Companies
Food and Beverage
In-kind items and services
DUPIXENT General $27.96
Boehringer Ingelheim Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
OFEV General $27.64
Grifols Shared Services North America, Inc.
Food and Beverage
In-kind items and services
Prolastin-C Liquid General $27.23
GlaxoSmithKline, LLC.
Food and Beverage
In-kind items and services
NUCALA General $25.46

(top 25 shown)

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

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2024.

CMS Part B · Data Year 2024
Reporting Year:

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
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
777 489 $270.00 $172.11
94726 Test to determine lung volumes using sensors
595 485 $150.00 $50.99
94729 Test to examine how well the lungs exchange gases
590 484 $99.00 $51.26
94060 Test to measure expiratory airflow and volume changes before and after medication administration
450 388 $116.00 $35.46
94010 Test to measure expiratory airflow and volume
240 212 $67.00 $25.19
94660 Therapy procedure using a positive pressure ventilator
220 204 $116.00 $60.32
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
208 101 $206.75 $118.93
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
156 156 $312.00 $159.96
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
142 133 $200.00 $117.90
J2919 Injection, methylprednisolone sodium succinate, 5 mg
124 16 $5.32 $0.28
G0398 Home sleep study test (hst) with type ii portable monitor, unattended; minimum of 7 channels: eeg, eog, emg, ecg/heart rate, airflow, respiratory effort and oxygen saturation
97 95 $350.00 $201.29
94618 Test for exercise-induced lung stress
84 81 $123.00 $31.82
71045 X-ray of chest, 1 view
62 54 $60.00 $23.75
95811 Sleep study in sleep lab with continuous airway pressure (6 years or older)
51 49 $1500.00 $593.94
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
39 35 $387.00 $175.18
96372 Injection of drug or substance under skin or into muscle
35 28 $44.00 $13.42
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
29 29 $389.00 $212.68
95810 Sleep study in sleep lab (6 years or older)
14 14 $1358.14 $568.81
J2920 Injection, methylprednisolone sodium succinate, up to 40 mg
14 13 $20.00 $4.12
31645 Aspiration of initial secretion of lung airway using an endoscope
11 11 $250.00 $135.58
99213 Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
11 11 $135.00 $72.81

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.

CMS Part D · Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Trelegy Ellipta Fluticasone/Umeclidin/Vilanter 440 21,690 $446,579.05 121
Montelukast Sodium Montelukast Sodium 283 20,430 $3,177.78 106
Prednisone Prednisone 217 5,076 $795.29 142
Albuterol Sulfate Hfa Albuterol Sulfate 197 5,974 $5,946.49 114
Breztri Aerosphere Budesonide/Glycopyr/Formoterol 117 4,710 $98,568.38 28
Ofev Nintedanib Esylate 103 3,090 $1,291,715.36 17
Azithromycin Azithromycin 78 5,345 $1,667.99 40
Breo Ellipta Fluticasone/Vilanterol 78 3,930 $48,570.26 25
Trazodone Hcl Trazodone Hcl 63 3,390 $887.65 28
Pantoprazole Sodium Pantoprazole Sodium 37 2,115 $395.07 17
Fluticasone-Salmeterol Fluticasone Propion/Salmeterol 37 1,830 $7,347.98 13
Fluticasone Propionate Fluticasone Propionate 36 1,920 $431.95 —
Advair Hfa Fluticasone Propion/Salmeterol 32 1,200 $14,787.31 12
Spiriva Respimat Tiotropium Bromide 31 2,070 $34,192.86 —
Doxycycline Hyclate Doxycycline Hyclate 29 294 $211.74 27
Omeprazole Omeprazole 27 1,410 $278.32 12
Dupixent Pen Dupilumab 27 742 $98,456.04 —
Anoro Ellipta Umeclidinium Brm/Vilanterol Tr 26 1,320 $19,779.59 11
Ventolin Hfa Albuterol Sulfate 25 679 $1,493.00 13
Wixela Inhub Fluticasone Propion/Salmeterol 24 1,140 $2,883.82 —
Symbicort Budesonide/Formoterol Fumarate 23 1,230 $9,788.49 —
Ipratropium Bromide Ipratropium Bromide 21 648 $793.82 12
Stiolto Respimat Tiotropium Br/Olodaterol Hcl 21 1,050 $17,028.11 —
Famotidine Famotidine 19 1,470 $319.40 15
Combivent Respimat Ipratropium/Albuterol Sulfate 19 700 $12,017.35 —

(top 25 shown)

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: 2021-12-21
Internal Medicine - Pulmonary Disease Primary Specialty

NUCC Taxonomy Code: 207RP1001X

License # reported to NPPES IL 036-104219

An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.

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: Illinois Department of Financial and Professional Regulation.
Look Up on State Board Site

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid ID
036104219 (IL)
Other Identifier Ptan
K48748

Medicare (PECOS) Enrollment & Ordering Eligibility

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

PRACTITIONER - CRITICAL CARE (INTENSIVISTS)

Medicare Enrollment ID

I20210920000700

Enrollment State Jurisdiction

IN

PECOS Control ID

8022003318

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

Northwest Pulmonary And Sleep Medicine Sc

1340 Ryan Pkwy, Algonquin, IL 601024527

Phone: 8154777350

Clinicians Sharing This Practice Address or Phone

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

3 listed
Julie Grandolfo , FNP-BC

Nurse Practitioner - Adult Health

NPI 1093312977

Family Nurse Practitioner (Board Certified)

Dr. Madhu Gundavaram , MD

Internal Medicine

NPI 1699796920

Doctor of Medicine (M.D.)

NPI 1972558567

Doctor of Medicine (M.D.), FCCP

Career & Practice History Timeline

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

8 Historical Events
📍
Updated Practice Location September 01, 2020

Registered at 1340 RYAN PKWY, ALGONQUIN, IL 601024527 (Tel: 8154777350)

📍
Updated Business Mailing Address December 23, 2019

Registered at 1340 RYAN PKWY, ALGONQUIN, IL 601024527 (Tel: 8154777350)

âś…
NPI Profile Active January 09, 2015

NPI status registered as active in NPPES database

📍
Practice Location (Initial Record) January 09, 2015

Registered at 360 STATION DR, CRYSTAL LAKE, IL 600147978 (Tel: 8154777350)

📍
Business Mailing Address (Initial Record) January 09, 2015

Registered at PO BOX 859, CRYSTAL LAKE, IL 600390859 (Tel: 8154777350)

👤
Provider Name / Credentials (Initial Record) January 09, 2015

Recorded as DENNIS KELLAR, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) January 09, 2015

Internal Medicine (license number reported to NPPES: IL 036-104219)

🟢
Initial NPI Registration & Enumeration August 30, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1679683866
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 30, 2006
Last Update: December 21, 2021
Sole Proprietor: Yes

Mailing Address

1340 Ryan Pkwy

Algonquin, IL 601024527

Phone: 8154777350

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.