Dr. Thomas Jefferson Gernon, MD

  • Duarte, CA
  • Otolaryngologist
NPI1548387525PAC ID7719018928
Medicare services, 2024
500
Medicare patients, 2024
237
Part D claims, 2024
22
Publications
14
MIPS score, 2024
93
Practice address
1500 Duarte Rd, Duarte, CA 91010
Practice phone
Call (800) 826-4673
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

City of Hope Comprehensive Cancer Center - Duarte

Duarte, California

See all 4 affiliations

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Dr. Thomas Jefferson Gernon is an otolaryngologist in Duarte, California

Dr. Gernon practices at City of Hope Comprehensive Cancer Center - Duarte in Duarte, California.

Dr. Gernon's NPI, 1548387525, was assigned on March 23, 2007. Dr. Gernon graduated from University Of Washington School Of Medicine in 2005. Dr. Gernon's California license number on file is C139412.

NPI and contact details
Medicare PAC ID
7719018928
NPI enumeration date
March 23, 2007
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(800) 826-4673
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
47
Medical school graduation
2005

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Thomas Jefferson Gernon practices at City of Hope Comprehensive Cancer Center - Duarte in Duarte, California

Dr. Gernon's primary practice is City of Hope Comprehensive Cancer Center - Duarte, at 1500 Duarte Rd, Duarte, CA 91010 in Los Angeles County. The practice phone is (800) 826-4673.

  • City of Hope Comprehensive Cancer Center - Duarte
    1500 Duarte Rd, Duarte, CA 91010 · Los Angeles CountyPhone(800) 826-4673

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Thomas Jefferson Gernon is affiliated with 3 sites of care and 1 medical group

Dr. Gernon's primary practice is City of Hope Comprehensive Cancer Center - Duarte in Duarte, California. The medical group on file is City of Hope. Dmand AI also links Dr. Gernon to 1 more group practice or clinic and 1 other site, each named with a free account.

See all 4 affiliations for Dr. Gernon

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Thomas Jefferson Gernon's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gernon practices, 2 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
City of Hope Comprehensive Cancer Center - DuarteAvailable with a free account
+2 more affiliated sitesAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Thomas Jefferson Gernon is one of 1,107 otolaryngologists in California

Otolaryngology is Dr. Gernon's primary specialty in the NPI Registry, under taxonomy code 207Y00000X. Dr. Gernon is board certified in otolaryngology by the American Board of Otolaryngology - Head and Neck Surgery. Dmand AI has Dr. Gernon's licenses on file in 4 states: California, Arizona, Washington and Michigan.

Specialties and state licenses

  • Otolaryngology, CaliforniaPrimaryLicense C139412 · 2015 to 2025 · taxonomy 207Y00000X
  • Arizona licenseLicense 45335 · 2011 to 2019
  • Washington license2010 to 2012
  • Michigan license2005 to 2010

Clinical focus

Dmand AI lists ear infection, endoscopic sinus surgery, larynx and vocal cord disease and thyroid surgery among the conditions Dr. Gernon treats.

Otolaryngologists near Dr. Gernon

Counts of otolaryngologists with a Dmand AI profile, by place and practice. Each opens the list.

1,107otolaryngologists in California
6otolaryngologists in Duarte

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Thomas Jefferson Gernon billed Medicare for 500 services in 2024

CMS data shows 500 Medicare services from Dr. Gernon across 8 procedure codes in 2024, for 237 Medicare patients. Medicare paid $56,577 for them.

Medicare services, 2024500
Medicare patients237
Paid by Medicare$56,577
Procedure codes8

Dr. Gernon's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 3182024: 3221%
Surgery
2023: 1492024: 1387%
Other services
2023: 02024: 40

Where Dr. Gernon's Medicare services took place, 2024

  • In an office214%
  • In a facility47996%

Dr. Gernon compared with the California median for otolaryngologists, 2024

  • Dr. Gernon
  • California median
Medicare services
500vs 66625% below
Medicare patients
237vs 29620% below
Part D claims
12vs 11890% below

Medians across 1,045 otolaryngologists in California with Dmand AI profiles that report each measure.

Dr. Gernon's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Gernon

Need commercial claims for Dr. Gernon?

Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gernon and other otolaryngologists in California.

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Thomas Jefferson Gernon treated 237 Medicare patients in 2024, average age 73

CMS counts 237 Medicare patients who saw Dr. Gernon in 2024. The largest group is 65 to 74, with 130 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 1.96, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Gernon's median patient age at 68, with 41% women.

Medicare patients, 2024237
Average age73
Average risk score1.96
Also on Medicaid30%

Dr. Gernon's Medicare patients by age, 2024

Dr. Gernon's Medicare patients by sex, 2024

  • Women9239%
  • Men14561%

Chronic conditions among Dr. Gernon's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis40%
  4. Diabetes33%
  5. Cancer30%
  6. Ischemic heart disease30%
  7. COPD23%
  8. Chronic kidney disease22%

Share of Medicare patients with each condition. A patient can have several.

Dr. Gernon's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 68

Patient panel by sex, all payers

  • Women41%
  • Men58%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Thomas Jefferson Gernon wrote 22 Medicare Part D claims in 2024

In 2024, Dr. Gernon wrote 22 Medicare Part D claims for 20 patients. 100% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $92 in total drug cost. In 2021, CMS named 12 claims across 1 drug.

Part D claims, 202422
Drugs named by CMS1
Total drug cost$92
Part D patients20

Dr. Gernon's most prescribed drugs by claims, 2023

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Gernon's Part D claims, 2024

  • Opioids77%17 of 22 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2021 to 2023

  • 2021
  • 2023
Claims for drugs CMS names
2021: 122023: 12No change

Drugs named by CMS: 1 in 2023, 1 in 2021.

See all prescribing by Dr. Gernon

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Thomas Jefferson Gernon scored 93 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Gernon for performance year 2024, reported as part of a group. Dr. Gernon accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gernon as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Gernon's MIPS scores, performance year 2024

  • 93of 100Final score
  • 78.5of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities
  • 70of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)

Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)

Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)

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Dr. Thomas Jefferson Gernon has 14 publications on record

Dmand AI links 14 papers to Dr. Gernon, published from 2013 to 2024. 2013 was the busiest year, with 2. The most frequent topics are Carcinoma, Squamous Cell, DNA-Binding Proteins and Mouth Neoplasms. Dr. Gernon's most frequent co-authors are Ellie G. Maghami, MD, Arya Amini, MD and Robert Suk Kang.

Papers14
Years published2013 to 2024

Dr. Gernon's papers by year, 2013 to 2024

Topics Dr. Gernon writes about most

  • Carcinoma, Squamous Cell
  • DNA-Binding Proteins
  • Mouth Neoplasms

Dr. Gernon's most frequent co-authors

Recent publications by Dr. Gernon

See all 14 publications and co-authors

See who Dr. Gernon researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Gernon works with, so you can find a warm path to the right otolaryngologists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Thomas Jefferson Gernon received $5,542 in industry payments from 2016 to 2025

CMS Open Payments shows 19 general payments to Dr. Gernon from 11 drug and device companies from 2016 to 2025. Education make up the largest share, 81% of the total. Intuitive Surgical, Inc. paid the most, $5,016.

General payments to Dr. Gernon by program year, 2016 to 2025

General payments to Dr. Gernon by kind, 2016 to 2025

$5.5Kin total
  • Education$4,50081%
  • Food and beverage$57210%
  • Travel and lodging$4708%

Companies that paid Dr. Gernon the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Gernon

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Thomas Jefferson Gernon graduated from University Of Washington School Of Medicine

Dr. Gernon graduated from University Of Washington School Of Medicine in 2005.

  1. Medical schoolUniversity Of Washington School Of Medicine
  2. Board certified in otolaryngologyAmerican Board of Otolaryngology - Head and Neck Surgery

Source: Dmand AI Professional Profile Data

Dr. Thomas Jefferson Gernon accepts plans from 10 insurance carriers

Dr. Gernon is in network with 10 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.

Plan types Dr. Gernon accepts, by number of carriers

  1. Medicare8
  2. HMO6
  3. PPO6
  4. POS3
  5. EPO1
  6. Medicaid1

Source: Dmand AI Insurance Network Data

Sources for Dr. Thomas Jefferson Gernon's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Thomas Jefferson Gernon

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Thomas Jefferson Gernon's NPI number?

Dr. Thomas Jefferson Gernon's NPI number is 1548387525. It was assigned on March 23, 2007, and it is active in the NPI Registry.

What kind of doctor is Dr. Thomas Jefferson Gernon?

Dr. Thomas Jefferson Gernon is an otolaryngologist in Duarte, California. The primary specialty in the NPI Registry is Otolaryngology Physician (taxonomy code 207Y00000X).

Where does Dr. Thomas Jefferson Gernon practice?

Dr. Gernon practices at 1500 Duarte Rd, Duarte, CA 91010. Dr. Gernon's primary practice is City of Hope Comprehensive Cancer Center - Duarte in Duarte, California. Dmand AI also links Dr. Gernon to 1 group practice or clinic and 1 other site.

What is Dr. Thomas Jefferson Gernon's office phone number?

The practice phone on file for Dr. Gernon is (800) 826-4673.

What is Dr. Thomas Jefferson Gernon's medical license number?

Dr. Gernon's California license number on file is C139412, one of the licenses on file in 4 states.

Which states has Dr. Thomas Jefferson Gernon been licensed in?

Dmand AI has state licenses on file for Dr. Gernon in California (2015 to 2025), Arizona (2011 to 2019), Washington (2010 to 2012) and Michigan (2005 to 2010).

What medical group is Dr. Thomas Jefferson Gernon part of?

Dr. Gernon is linked to City of Hope.

Does Dr. Thomas Jefferson Gernon accept Medicare?

Yes. CMS data shows Dr. Gernon billed Medicare for 500 services in 2024, and Dr. Gernon accepts Medicare assignment.

Does Dr. Thomas Jefferson Gernon offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Gernon as offering telehealth services.

What is Dr. Thomas Jefferson Gernon's MIPS score?

Dr. Gernon's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.

Show 10 more questionsShow fewer questions

How many Medicare patients does Dr. Thomas Jefferson Gernon see?

CMS counts 237 Medicare patients who saw Dr. Gernon in 2024, with an average age of 73.

Is Dr. Thomas Jefferson Gernon board certified?

Yes. Dr. Gernon is board certified in otolaryngology by the American Board of Otolaryngology - Head and Neck Surgery.

What services does Dr. Thomas Jefferson Gernon bill to Medicare?

In 2024, Dr. Gernon's most billed Medicare services were office visit, established patient (99213), surgery: lungs and airway (31575) and office visit, established patient (99214).

Where did Dr. Thomas Jefferson Gernon go to medical school?

Dr. Gernon graduated from University Of Washington School Of Medicine in 2005.

What drugs does Dr. Thomas Jefferson Gernon prescribe most?

In 2023 Medicare Part D data, Dr. Gernon's most prescribed drugs by claims were Hydrocodone-Acetaminophen.

Has Dr. Thomas Jefferson Gernon received payments from drug or device companies?

CMS Open Payments shows $5,542 in general payments to Dr. Gernon from 11 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.

How long has Dr. Thomas Jefferson Gernon been practicing?

Dr. Gernon graduated from medical school in 2005, 21 years ago.

Does Dr. Thomas Jefferson Gernon do research?

Dmand AI links 14 publications to Dr. Gernon, published from 2013 to 2024.

Who does Dr. Thomas Jefferson Gernon publish with?

Dr. Gernon's most frequent co-authors are Ellie G. Maghami, MD (7 shared papers), Arya Amini, MD (3 shared papers) and Robert Suk Kang (3 shared papers).

What insurance does Dr. Thomas Jefferson Gernon accept?

Dr. Gernon is in network with 10 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.

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