Dr. Karen Jean Friday, MD

  • Stanford, CA
  • Cardiologist
NPI1326067448PAC ID5496820326
Medicare services, 2024
13,887
Medicare patients, 2024
8,228
Part D claims, 2024
50
Publications
35
MIPS score, 2024
89
Practice address
300 Pasteur Drive, Stanford, CA 94305
Practice phone
Call (650) 723-4000
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

Stanford Hospital at 300 Pasteur Drive

Hospital · Stanford, California

See all 7 affiliations

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Dr. Karen Jean Friday is a cardiologist in Stanford, California

Dr. Friday practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University.

Dr. Friday's NPI, 1326067448, was assigned on July 19, 2006. Dr. Friday graduated from Cleveland Medical College, Homeopathic in 1976. Dr. Friday holds California license G68124.

NPI and contact details
Medicare PAC ID
5496820326
NPI enumeration date
July 19, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(650) 723-4000
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Female
Estimated age
76
Medical school graduation
1976

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

Dr. Karen Jean Friday practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California

Dr. Friday's primary practice is Stanford Hospital at 300 Pasteur Drive, at 300 Pasteur Drive, Stanford, CA 94305 in Santa Clara County. The practice phone is (650) 723-4000.

Source: Dmand AI Affiliation Data

Dr. Karen Jean Friday is affiliated with 6 sites of care and 1 medical group

Dr. Friday's primary practice is Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University. Dr. Friday is also affiliated with Santa Clara Valley Medical Center. The medical group on file is Stanford Health Care. Dmand AI also links Dr. Friday to 4 more hospitals, each named with a free account. Dr. Friday's employer is on file too: a hospital.

See all 7 affiliations for Dr. Friday

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Karen Jean Friday's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Friday practices, 6 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Stanford Hospital at 300 Pasteur DriveAvailable with a free account
+5 more affiliated sitesAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Karen Jean Friday is one of 2,375 cardiologists in California

Cardiovascular disease is Dr. Friday's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Friday is board certified in cardiovascular disease by the American Board of Internal Medicine. Dmand AI has Dr. Friday's licenses on file in 3 states: California, Oklahoma and Ohio.

Specialties and state licenses

  • Cardiovascular disease, CaliforniaPrimaryLicense G68124 · 1990 to 2027 · taxonomy 207RC0000X
  • Oklahoma license1982 to 1990
  • Ohio license1979 to 1984

Clinical focus

Dmand AI lists low blood pressure and ventricular tachycardia among the conditions Dr. Friday treats.

Cardiologists near Dr. Friday

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

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

Dr. Karen Jean Friday billed Medicare for 13,887 services in 2024

CMS data shows 13,887 Medicare services from Dr. Friday across 3 procedure codes in 2024, for 8,228 Medicare patients. Medicare paid $100,413 for them.

Medicare services, 202413,887
Medicare patients8,228
Paid by Medicare$100,413
Procedure codes3

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

  • 2023
  • 2024
Tests and treatments
2023: 15,6922024: 13,88712%

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

  • In an office7235%
  • In a facility13,16495%

Dr. Friday compared with the California median for cardiologists, 2024

  • Dr. Friday
  • California median
Medicare services
13,887vs 1,5608.9 times
Medicare patients
8,228vs 64412.8 times
Part D claims
25vs 1,41098% below

Medians across 2,237 cardiologists in California with Dmand AI profiles that report each measure.

Dr. Friday'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. Friday

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

Dr. Karen Jean Friday treated 8,228 Medicare patients in 2024, average age 75

CMS counts 8,228 Medicare patients who saw Dr. Friday in 2024. The largest group is 65 to 74, with 3,153 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 27% are also on Medicaid. Their average risk score is 1.94, 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. Friday's median patient age at 57, with 49% women.

Medicare patients, 20248,228
Average age75
Average risk score1.94
Also on Medicaid27%

Dr. Friday's Medicare patients by age, 2024

Dr. Friday's Medicare patients by sex, 2024

  • Women4,00749%
  • Men4,22151%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Ischemic heart disease42%
  4. Arthritis41%
  5. Atrial fibrillation38%
  6. Chronic kidney disease37%
  7. Diabetes35%
  8. Heart failure34%

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

Dr. Friday's patients across all payers

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

Patient panel by age, all payers

Median age 57

Patient panel by sex, all payers

  • Women49%
  • Men50%

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

Dr. Karen Jean Friday wrote 50 Medicare Part D claims in 2024

In 2024, Dr. Friday wrote 50 Medicare Part D claims. 46% of them were for generic drugs. CMS names the drug for 25 of them, across 1 drug with 11 or more claims each, at $13,051 in total drug cost. In 2023, CMS named 30 claims across 2 drugs.

Part D claims, 202450
Drugs named by CMS1
Total drug cost$13,051

Dr. Friday's Part D claims by kind of drug, 2024

  • Generic23 claims46%
  • Brand-name27 claims54%

Dr. Friday's most prescribed drugs by claims, 2024

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

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 302024: 2517%

Drugs named by CMS: 1 in 2024, 2 in 2023.

See all prescribing by Dr. Friday

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. Karen Jean Friday scored 89 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Dr. Friday for performance year 2024, reported as part of a group. Dr. Friday accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Friday as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Dr. Friday's MIPS scores, performance year 2024

  • 89of 100Final score
  • 87.1of 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.

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

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Dr. Karen Jean Friday has 35 publications on record

Dmand AI links 35 papers to Dr. Friday, published from 2011 to 2015. 2013 was the busiest year, with 3. The most frequent topics are Heart Conduction System, Cardiac Pacing, Artificial and Electrocardiography. Dr. Friday has published most often in Circulation. Dr. Friday's most frequent co-authors are David Michael Fitzgerald, MD, Sung Hwan Chun, MD and L. Bing Liem, DO.

Papers35
Years published2011 to 2015

Dr. Friday's papers by year, 2011 to 2015

Topics Dr. Friday writes about most

  • Heart Conduction System
  • Cardiac Pacing, Artificial
  • Electrocardiography
  • Electrophysiology
  • Anti-Arrhythmia Agents
  • Cardiac Catheterization
  • Tachycardia
  • Atrioventricular Node

Dr. Friday's most frequent co-authors

Recent publications by Dr. Friday

See all 35 publications and co-authors

See who Dr. Friday researches with

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

How network discovery works

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

Dr. Karen Jean Friday received $6,580 in industry payments from 2016 to 2023

CMS Open Payments shows 52 general payments to Dr. Friday from 7 drug and device companies from 2016 to 2023. Travel and lodging make up the largest share, 57% of the total. Medtronic Vascular, Inc. paid the most, $3,690.

General payments to Dr. Friday by program year, 2016 to 2023

General payments to Dr. Friday by kind, 2016 to 2023

$6.6Kin total
  • Travel and lodging$3,78157%
  • Food and beverage$2,79943%

Companies that paid Dr. Friday the most, 2016 to 2023

Share is of all general payments to this clinician.

See all payments to Dr. Friday

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

Dr. Karen Jean Friday has 1 award and honors on record

Dmand AI lists 1 award for Dr. Friday, most recently CMS Stage 1 EHR in 2013.

Awards and honors for Dr. Friday

  1. 2013
    • CMS Stage 1 EHR

Source: Dmand AI Professional Profile Data

Dr. Karen Jean Friday graduated from Cleveland Medical College, Homeopathic

Dr. Friday graduated from Cleveland Medical College, Homeopathic in 1976. Dr. Friday is a member of ACP.

  1. Medical schoolCleveland Medical College, Homeopathic
  2. Board certified in cardiovascular diseaseAmerican Board of Internal Medicine
  3. Board certified in internal medicineAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Karen Jean Friday accepts plans from 10 insurance carriers

Dr. Friday is in network with 10 carriers, including Aetna, Excellus BlueCross BlueShield and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

  • Aetna
  • Excellus BlueCross BlueShield
  • Blue Cross Blue Shield of Michigan
  • Elevance
  • Blue Cross Blue Shield of Massachusetts
  • Regence Health Plans
  • United Healthcare
  • Blue Cross and Blue Shield of Kansas City
  • +2 more carriersWith a free account

Plan types Dr. Friday accepts, by number of carriers

  1. Medicare6
  2. PPO6
  3. HMO5
  4. POS5
  5. EPO4
  6. Medicaid1

Source: Dmand AI Insurance Network Data

Sources for Dr. Karen Jean Friday'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 phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand 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)
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)
Awards and committee rolesDmand AI Professional Profile Data
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. Karen Jean Friday

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. Karen Jean Friday's NPI number?

Dr. Karen Jean Friday's NPI number is 1326067448. It was assigned on July 19, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. Karen Jean Friday?

Dr. Karen Jean Friday is a cardiologist in Stanford, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).

Where does Dr. Karen Jean Friday practice?

Dr. Friday practices at 300 Pasteur Drive, Stanford, CA 94305. Dr. Friday's primary practice is Stanford Hospital at 300 Pasteur Drive in Stanford, California, part of Stanford University. Dmand AI also links Dr. Friday to 4 hospitals.

What is Dr. Karen Jean Friday's office phone number?

The practice phone on file for Dr. Friday is (650) 723-4000.

What is Dr. Karen Jean Friday's medical license number?

Dr. Friday holds California license G68124, one of the licenses on file in 3 states.

Which states has Dr. Karen Jean Friday been licensed in?

Dmand AI has state licenses on file for Dr. Friday in California (1990 to 2027), Oklahoma (1982 to 1990) and Ohio (1979 to 1984).

Which hospitals is Dr. Karen Jean Friday affiliated with?

Dr. Friday practices at Stanford Hospital at 300 Pasteur Drive in Stanford, California. Dr. Friday is also affiliated with Santa Clara Valley Medical Center. Dmand AI links Dr. Friday to 4 more hospitals.

What medical group is Dr. Karen Jean Friday part of?

Dr. Friday is linked to Stanford Health Care.

Does Dr. Karen Jean Friday accept Medicare?

Yes. CMS data shows Dr. Friday billed Medicare for 13,887 services in 2024, and Dr. Friday accepts Medicare assignment.

Does Dr. Karen Jean Friday offer telehealth?

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

Show 11 more questionsShow fewer questions

What is Dr. Karen Jean Friday's MIPS score?

Dr. Friday's MIPS final score for performance year 2024 is 89 out of 100, reported as part of a group.

How many Medicare patients does Dr. Karen Jean Friday see?

CMS counts 8,228 Medicare patients who saw Dr. Friday in 2024, with an average age of 75.

Is Dr. Karen Jean Friday board certified?

Yes. Dr. Friday is board certified in cardiovascular disease by the American Board of Internal Medicine.

What services does Dr. Karen Jean Friday bill to Medicare?

In 2024, Dr. Friday's most billed Medicare services were heart test or procedure (93010), heart test or procedure (93000) and heart test or procedure (93248).

Where did Dr. Karen Jean Friday go to medical school?

Dr. Friday graduated from Cleveland Medical College, Homeopathic in 1976.

What drugs does Dr. Karen Jean Friday prescribe most?

In 2024 Medicare Part D data, Dr. Friday's most prescribed drugs by claims were Nicotrol Ns.

Has Dr. Karen Jean Friday received payments from drug or device companies?

CMS Open Payments shows $6,580 in general payments to Dr. Friday from 7 companies from 2016 to 2023. The largest total came from Medtronic Vascular, Inc.

How long has Dr. Karen Jean Friday been practicing?

Dr. Friday graduated from medical school in 1976, 50 years ago.

Does Dr. Karen Jean Friday do research?

Dmand AI links 35 publications to Dr. Friday, published from 2011 to 2015.

Who does Dr. Karen Jean Friday publish with?

Dr. Friday's most frequent co-authors are David Michael Fitzgerald, MD (4 shared papers), Sung Hwan Chun, MD (3 shared papers) and L. Bing Liem, DO (3 shared papers).

What insurance does Dr. Karen Jean Friday accept?

Dr. Friday is in network with 10 carriers, including Aetna, Excellus BlueCross BlueShield and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

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