Catherine K. Pyun

  • Alameda, CA
  • Internist
NPI1154390144PAC ID1254375983
Medicare services, 2024
624
Medicare patients, 2024
310
Part D claims, 2024
212
Hospital affiliations
2
Industry payments
$123
Practice address
2070 Clinton Avenue, Alameda, CA 94501
Practice phone
Call (510) 522-3700
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Alameda Hospital

Hospital · Alameda, California

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Catherine K. Pyun is an internist in Alameda, California

Catherine Pyun practices at Alameda Hospital in Alameda, California, part of Alameda County.

Catherine Pyun's NPI, 1154390144, was assigned on March 14, 2006. Catherine Pyun graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 1994. Catherine Pyun holds California license 20A6823.

NPI and contact details
Medicare PAC ID
1254375983
NPI enumeration date
March 14, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(510) 522-3700
Professional email
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Personal email
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Mobile number
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Sex
Female
Estimated age
58
Medical school graduation
1994

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

Catherine K. Pyun practices at Alameda Hospital in Alameda, California

Catherine Pyun's primary practice is Alameda Hospital, at 2070 Clinton Avenue, Alameda, CA 94501 in Alameda County. The practice phone is (510) 522-3700.

  • Alameda Hospital
    2070 Clinton Avenue, Alameda, CA 94501 · Alameda CountyPhone(510) 522-3700

Source: Dmand AI Affiliation Data

Catherine K. Pyun is affiliated with 2 sites of care and 1 medical group

Catherine Pyun's primary practice is Alameda Hospital in Alameda, California, part of Alameda County. Catherine Pyun is also affiliated with Alameda Health System - Highland Hospital. The medical group on file is Alameda Inpatient Medical, Inc.

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

Dmand AI tracks the EHR system at Catherine K. Pyun's practice

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

EHR by site
SiteEHR vendor and product
Alameda HospitalAvailable with a free account
+1 more affiliated siteAvailable with a free account

Source: Dmand AI Technology Install Data

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Catherine K. Pyun is one of 16,751 internists in California

Internal medicine is Catherine Pyun's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Catherine Pyun is board certified in acls dec 2017 to dec 2019 by the Advanced Cardiac Life Support. Catherine Pyun is licensed in California.

Specialties and state licenses

  • Internal medicine, CaliforniaPrimaryLicense 20A6823 · 1996 to 2026 · taxonomy 207R00000X

Clinical focus

Dmand AI lists atrial fibrillation and flutter, cerebrovascular disease, chronic hypertension, chronic kidney disease, chronic skin ulcer, cirrhosis of the liver, congestive heart failure and electrolyte disorders among the conditions Catherine Pyun treats.

Internists near Catherine Pyun

Counts of internists 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

Catherine K. Pyun billed Medicare for 624 services in 2024

CMS data shows 624 Medicare services from Catherine Pyun across 8 procedure codes in 2024, for 310 Medicare patients. Medicare paid $63,525 for them.

Medicare services, 2024624
Medicare patients310
Paid by Medicare$63,525
Procedure codes8

Catherine Pyun's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 7482024: 62417%

Where Catherine Pyun's Medicare services took place, 2024

  • In an office6711%
  • In a facility55789%

Catherine Pyun compared with the California median for internists, 2024

  • Catherine Pyun
  • California median
Medicare services
624vs 36173% above
Medicare patients
310vs 1512.1 times
Part D claims
33vs 42192% below

Medians across 15,815 internists in California with Dmand AI profiles that report each measure.

Catherine Pyun'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.

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

Catherine K. Pyun treated 310 Medicare patients in 2024, average age 69

CMS counts 310 Medicare patients who saw Catherine Pyun in 2024. The largest group is under 65, with 96 patients. 75% of them have high blood pressure, and 66% have high cholesterol. 81% are also on Medicaid. Their average risk score is 2.48, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Catherine Pyun's median patient age at 58, with 38% women.

Medicare patients, 2024310
Average age69
Average risk score2.48
Also on Medicaid81%

Catherine Pyun's Medicare patients by age, 2024

Catherine Pyun's Medicare patients by sex, 2024

  • Women16052%
  • Men15048%

Chronic conditions among Catherine Pyun's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol66%
  3. Diabetes50%
  4. Mood disorders47%
  5. Anxiety40%
  6. Depression40%
  7. Alzheimer's and dementia35%
  8. Arthritis34%

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

Catherine Pyun's patients across all payers

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

Patient panel by age, all payers

Median age 58

Patient panel by sex, all payers

  • Women38%
  • Men59%

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

Catherine K. Pyun wrote 212 Medicare Part D claims in 2024

In 2024, Catherine Pyun wrote 212 Medicare Part D claims for 80 patients. 82% of them were for generic drugs. CMS names the drug for 33 of them, across 1 drug with 11 or more claims each, at $339 in total drug cost. In 2023, CMS named 84 claims across 3 drugs.

Part D claims, 2024212
Drugs named by CMS1
Total drug cost$339
Part D patients80

Catherine Pyun's Part D claims by kind of drug, 2024

  • Generic173 claims82%
  • Brand-name39 claims18%

Catherine Pyun'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.

Drug classes CMS tracks in Catherine Pyun's Part D claims, 2024

  • Antibiotics9%19 of 212 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, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 842024: 3361%

Drugs named by CMS: 1 in 2024, 3 in 2023.

See all prescribing by Catherine Pyun

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

How Catherine K. Pyun takes part in Medicare

Catherine Pyun accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Catherine K. Pyun received $123 in industry payments in 2024

CMS Open Payments shows 1 general payment to Catherine Pyun from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $123.

Companies that paid Catherine Pyun the most, 2024 to 2024

Share is of all general payments to this clinician.

See all payments to Catherine Pyun

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

Catherine K. Pyun has 2 awards and honors on record

Dmand AI lists 2 awards for Catherine Pyun, most recently American Medical Women's Association Janet M. Glasgow Award for Academic Excellence in 1994. Catherine Pyun serves on Medical Executive Committee Alameda Hospital and Quality and Safety Council Alameda Hospital.

Awards and honors for Catherine Pyun

  1. 1994
    • American Medical Women's Association Janet M. Glasgow Award for Academic Excellence
    • Distinctive Scholar

Catherine Pyun's committees and leadership roles

Medical Executive Committee Alameda HospitalVice President
2018 to present
Quality and Safety Council Alameda HospitalChairman
2017 to present
Medical Executive Committee Alameda Health SystemsFairmont representative
2015 to 2017

Source: Dmand AI Professional Profile Data

Catherine K. Pyun graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury

Catherine Pyun graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 1994. Catherine Pyun is a member of Alameda County and Contra Costa County Medical Association, ACP, AOA and Society for Post Acute and Long Term Care.

  1. Medical schoolNew York Institute of Technology College of Osteopathic Medicine - Old Westbury
  2. Board certified in acls dec 2017 to dec 2019Advanced Cardiac Life Support
  3. Board certified in addiction medicineAmerican Board of Emergency Medicine
  4. Board certified in internal medicineAmerican Board of Internal Medicine
  5. Board certified in addiction medicineAmerican Board of Preventive Medicine
  6. Board certified in certified wound care specialist physicianAmerican Board of Wound Management
  7. Board certified in certified medical directorAmerican Medical Directors Association
  8. Board certified in buprenorphine waiverDEA
  9. Board certified in nihss august 2018-august 2020National Institute for Health and Stroke Score Certification

Source: Dmand AI Professional Profile Data

Catherine K. Pyun accepts plans from 12 insurance carriers

Catherine Pyun is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.

  • United Healthcare
  • Elevance
  • Aetna
  • Blue Cross Blue Shield of Michigan
  • HCSC
  • Alliant Health Plans
  • Blue Cross and Blue Shield of Kansas City
  • CMS Medicare
  • +4 more carriersWith a free account

Plan types Catherine Pyun accepts, by number of carriers

  1. PPO8
  2. HMO6
  3. EPO3
  4. Medicare2
  5. POS1

Source: Dmand AI Insurance Network Data

Sources for Catherine K. Pyun'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)
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 Catherine K. Pyun

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

What is Catherine K. Pyun's NPI number?

Catherine K. Pyun's NPI number is 1154390144. It was assigned on March 14, 2006, and it is active in the NPI Registry.

What does Catherine K. Pyun specialize in?

Catherine K. Pyun is an internist in Alameda, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).

Where does Catherine K. Pyun practice?

Catherine Pyun practices at 2070 Clinton Avenue, Alameda, CA 94501. Catherine Pyun's primary practice is Alameda Hospital in Alameda, California, part of Alameda County.

What is Catherine K. Pyun's office phone number?

The practice phone on file for Catherine Pyun is (510) 522-3700.

What is Catherine K. Pyun's medical license number?

Catherine Pyun holds California license 20A6823.

Which hospitals is Catherine K. Pyun affiliated with?

Catherine Pyun practices at Alameda Hospital in Alameda, California. Catherine Pyun is also affiliated with Alameda Health System - Highland Hospital.

What medical group is Catherine K. Pyun part of?

Catherine Pyun is linked to Alameda Inpatient Medical, Inc.

Does Catherine K. Pyun accept Medicare?

Yes. CMS data shows Catherine Pyun billed Medicare for 624 services in 2024, and Catherine Pyun accepts Medicare assignment.

How many Medicare patients does Catherine K. Pyun see?

CMS counts 310 Medicare patients who saw Catherine Pyun in 2024, with an average age of 69.

Is Catherine K. Pyun board certified?

Yes. Catherine Pyun is board certified in acls dec 2017 to dec 2019 by the Advanced Cardiac Life Support.

Show 6 more questionsShow fewer questions

What services does Catherine K. Pyun bill to Medicare?

In 2024, Catherine Pyun's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and nursing facility care (99309).

Where did Catherine K. Pyun go to medical school?

Catherine Pyun graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 1994.

What drugs does Catherine K. Pyun prescribe most?

In 2024 Medicare Part D data, Catherine Pyun's most prescribed drugs by claims were Atorvastatin Calcium.

Has Catherine K. Pyun received payments from drug or device companies?

CMS Open Payments shows $123 in general payments to Catherine Pyun from 1 company from 2024 to 2024. The largest total came from Abbvie Inc.

How long has Catherine K. Pyun been practicing?

Catherine Pyun graduated from medical school in 1994, 32 years ago.

What insurance does Catherine K. Pyun accept?

Catherine Pyun is in network with 12 carriers, including United Healthcare, Elevance and Aetna. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.

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