Dr. Karl Feng, MD
- Medicare services, 2024
- 887
- Medicare patients, 2024
- 585
- Part D claims, 2024
- 496
- Hospital affiliations
- 1
- Industry payments
- $33
- Practice address
- 101 E. Valencia Mesa Drive, Fullerton, CA 92835
- Practice phone
- Call (714) 578-8706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St. Jude Medical Center - Unit
Acute Care Hospital-Unit · Fullerton, California
Find Dr. Feng's professional email, personal email and mobile number
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Dr. Karl Feng is an emergency medicine physician in Fullerton, California
Dr. Feng practices at St. Jude Medical Center - Unit in Fullerton, California.
Dr. Feng's NPI, 1306875190, was assigned on July 2, 2006. Dr. Feng graduated from David Geffen School of Medicine at UCLA in 1996. Dr. Feng holds California license A72088.
- NPI
- 1306875190NPI Registry (opens in a new tab)
- NPI enumeration date
- July 2, 2006
- NPI status
- Active
- Practice phone
- (714) 578-8706
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Karl Feng practices at St. Jude Medical Center - Unit in Fullerton, California
Dr. Feng's primary practice is St. Jude Medical Center - Unit, at 101 E. Valencia Mesa Drive, Fullerton, CA 92835 in Orange County. The practice phone is (714) 578-8706.
- St. Jude Medical Center - Unit101 E. Valencia Mesa Drive, Fullerton, CA 92835 · Orange CountyPhone(714) 578-8706
Source: Dmand AI Affiliation Data
Dr. Karl Feng is affiliated with 1 site of care and 1 medical group
Dr. Feng's primary practice is St. Jude Medical Center - Unit in Fullerton, California. The medical group on file is St. Jude Emergency Medicine Group.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Karl Feng's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Feng practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Jude Medical Center - Unit | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Karl Feng is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Feng's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Feng is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Feng's licenses on file in 2 states: California and Florida.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Florida license
Emergency medicine physicians near Dr. Feng
Counts of emergency medicine physicians 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. Karl Feng billed Medicare for 887 services in 2024
CMS data shows 887 Medicare services from Dr. Feng across 5 procedure codes in 2024, for 585 Medicare patients. Medicare paid $95,824 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Feng's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7772024: 62320%
- Tests and treatments
- 2023: 2722024: 2643%
Dr. Feng compared with the California median for emergency medicine physicians, 2024
- Dr. Feng
- California median
- Medicare services
- 887vs 2653.3 times
- Medicare patients
- 585vs 2432.4 times
- Part D claims
- 354vs 625.7 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Feng'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
Dr. Karl Feng treated 585 Medicare patients in 2024, average age 77
CMS counts 585 Medicare patients who saw Dr. Feng in 2024. The largest group is 75 to 84, with 214 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 37% are also on Medicaid. Their average risk score is 2.40, 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. Feng's median patient age at 58, with 55% women.
Dr. Feng's Medicare patients by age, 2024
Dr. Feng's Medicare patients by sex, 2024
- Women33758%
- Men24842%
Chronic conditions among Dr. Feng's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Diabetes47%
- Chronic kidney disease45%
- Heart failure40%
- Mood disorders40%
- Ischemic heart disease38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Feng'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
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Karl Feng wrote 496 Medicare Part D claims in 2024
In 2024, Dr. Feng wrote 496 Medicare Part D claims for 356 patients. 95% of them were for generic drugs. CMS names the drug for 354 of them, across 12 drugs with 11 or more claims each, at $7,189 in total drug cost. In 2023, CMS named 309 claims across 10 drugs.
Dr. Feng's Part D claims by kind of drug, 2024
- Generic470 claims95%
- Brand-name and other26 claims5%
Dr. Feng'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 Dr. Feng's Part D claims, 2024
- Opioids16%77 of 496 claims
- Antibiotics42%210 of 496 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: 3092024: 35415%
Drugs named by CMS: 12 in 2024, 10 in 2023.
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
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Dr. Karl Feng received $33 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Feng from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $33.
Companies that paid Dr. Feng the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Karl Feng graduated from David Geffen School of Medicine at UCLA
Dr. Feng graduated from David Geffen School of Medicine at UCLA in 1996.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Karl Feng's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Karl Feng
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. Karl Feng's NPI number?
Dr. Karl Feng's NPI number is 1306875190. It was assigned on July 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Karl Feng?
Dr. Karl Feng is an emergency medicine physician in Fullerton, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Karl Feng practice?
Dr. Feng practices at 101 E. Valencia Mesa Drive, Fullerton, CA 92835. Dr. Feng's primary practice is St. Jude Medical Center - Unit in Fullerton, California.
What is Dr. Karl Feng's office phone number?
The practice phone on file for Dr. Feng is (714) 578-8706.
What is Dr. Karl Feng's medical license number?
Dr. Feng holds California license A72088, one of the licenses on file in 2 states.
Which states has Dr. Karl Feng been licensed in?
Dmand AI has state licenses on file for Dr. Feng in California (2000 to 2026) and Florida (1998 to 2002).
What medical group is Dr. Karl Feng part of?
Dr. Feng is linked to St. Jude Emergency Medicine Group.
Does Dr. Karl Feng accept Medicare?
Yes. CMS data shows Dr. Feng billed Medicare for 887 services in 2024.
How many Medicare patients does Dr. Karl Feng see?
CMS counts 585 Medicare patients who saw Dr. Feng in 2024, with an average age of 77.
Is Dr. Karl Feng board certified?
Yes. Dr. Feng is board certified in emergency medicine by the American Board of Emergency Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Karl Feng bill to Medicare?
In 2024, Dr. Feng's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
Where did Dr. Karl Feng go to medical school?
Dr. Feng graduated from David Geffen School of Medicine at UCLA in 1996.
What drugs does Dr. Karl Feng prescribe most?
In 2024 Medicare Part D data, Dr. Feng's most prescribed drugs by claims were Cefpodoxime Proxetil, Ondansetron ODT and Hydrocodone-Acetaminophen.
Has Dr. Karl Feng received payments from drug or device companies?
CMS Open Payments shows $33 in general payments to Dr. Feng from 1 company from 2025 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Karl Feng been practicing?
Dr. Feng graduated from medical school in 1996, 30 years ago.
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