Dr. Karen L. Butterfield, MD
- Medicare services, 2024
- 62
- Medicare patients, 2024
- 70
- Part D claims, 2024
- 98
- Industry payments
- $120
- Affiliated sites
- 2
- Practice address
- 795 El Camino Real, Palo Alto, CA 94301
- Practice phone
- Call (650) 324-1832
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Surgery Center Palo Alto
Surgery Center - Medicare-Certified · Palo Alto, California
Find Dr. Butterfield's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Karen L. Butterfield is an internist in Palo Alto, California
Dr. Butterfield practices at Surgery Center Palo Alto in Palo Alto, California.
Dr. Butterfield's NPI, 1619083144, was assigned on August 21, 2006. Dr. Butterfield graduated from Stanford University School Of Medicine in 1988. Dr. Butterfield holds California license G69715.
- NPI
- 1619083144NPI Registry (opens in a new tab)
- NPI enumeration date
- August 21, 2006
- NPI status
- Active
- Practice phone
- (650) 324-1832
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Karen L. Butterfield practices at Surgery Center Palo Alto in Palo Alto, California
Dr. Butterfield's primary practice is Surgery Center Palo Alto, at 795 El Camino Real, Palo Alto, CA 94301. The practice phone is (650) 324-1832.
- Surgery Center Palo Alto795 El Camino Real, Palo Alto, CA 94301Phone(650) 324-1832
Source: Dmand AI Affiliation Data
Dr. Karen L. Butterfield is affiliated with 2 sites of care and 1 medical group
Dr. Butterfield's primary practice is Surgery Center Palo Alto in Palo Alto, California. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Butterfield to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Karen L. Butterfield's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Butterfield practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Surgery Center Palo Alto | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Karen L. Butterfield is one of 16,751 internists in California
Internal medicine is Dr. Butterfield's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Butterfield is board certified in internal medicine by the American Board of Internal Medicine. Dr. Butterfield is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists atrial fibrillation and flutter, chronic diabetes, chronic hypertension, chronic nasal allergies, coronary artery disease, hereditary polyneuropathy, high cholesterol and itchy rashes among the conditions Dr. Butterfield treats.
Internists near Dr. Butterfield
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
Dr. Karen L. Butterfield billed Medicare for 62 services in 2024
CMS data shows 62 Medicare services from Dr. Butterfield across 2 procedure codes in 2024, all of them office visits, for 70 Medicare patients. Medicare paid $8,331 for them. Every service was in an office.
Dr. Butterfield's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 852024: 6227%
Dr. Butterfield compared with the California median for internists, 2024
- Dr. Butterfield
- California median
- Medicare services
- 62vs 36183% below
- Medicare patients
- 70vs 15154% below
- Part D claims
- 24vs 42194% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Butterfield'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.
Need commercial claims for Dr. Butterfield?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Butterfield and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Karen L. Butterfield treated 70 Medicare patients in 2024, average age 78
CMS counts 70 Medicare patients who saw Dr. Butterfield in 2024. The largest group is 75 to 84, with 29 patients. 66% of them have high blood pressure, and 66% have high cholesterol. Their average risk score is 0.97, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Butterfield's median patient age at 59, with 53% women.
Dr. Butterfield's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Butterfield's Medicare patients by sex, 2024
- Women5173%
- Men1927%
Chronic conditions among Dr. Butterfield's Medicare patients, 2024
- High blood pressure66%
- High cholesterol66%
- Arthritis40%
- Osteoporosis34%
- Ischemic heart disease23%
- Mood disorders21%
- Cancer20%
- Depression20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Butterfield's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women53%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Karen L. Butterfield wrote 98 Medicare Part D claims in 2024
In 2024, Dr. Butterfield wrote 98 Medicare Part D claims for 31 patients. 96% of them were for generic drugs. CMS names the drug for 24 of them, across 2 drugs with 11 or more claims each, at $241 in total drug cost. In 2023, CMS named 30 claims across 2 drugs.
Dr. Butterfield's Part D claims by kind of drug, 2024
- Generic94 claims96%
- Brand-name and other4 claims4%
Dr. Butterfield'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: 2420%
Drugs named by CMS: 2 in 2024, 2 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. Karen L. Butterfield received $120 in industry payments in 2017
CMS Open Payments shows 1 general payment to Dr. Butterfield from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Boehringer Ingelheim Pharmaceuticals, Inc. paid the most, $120.
Companies that paid Dr. Butterfield the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Karen L. Butterfield has 1 award and honors on record
Dmand AI lists 1 award for Dr. Butterfield, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Butterfield
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Karen L. Butterfield graduated from Stanford University School Of Medicine
Dr. Butterfield graduated from Stanford University School Of Medicine in 1988.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Karen L. Butterfield accepts plans from 1 insurance carrier
Dr. Butterfield is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Karen L. Butterfield'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 DataDmand AI Org Hierarchy 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) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Karen L. Butterfield
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 L. Butterfield's NPI number?
Dr. Karen L. Butterfield's NPI number is 1619083144. It was assigned on August 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Karen L. Butterfield?
Dr. Karen L. Butterfield is an internist in Palo Alto, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Karen L. Butterfield practice?
Dr. Butterfield practices at 795 El Camino Real, Palo Alto, CA 94301. Dr. Butterfield's primary practice is Surgery Center Palo Alto in Palo Alto, California. Dmand AI also links Dr. Butterfield to 1 group practice or clinic.
What is Dr. Karen L. Butterfield's office phone number?
The practice phone on file for Dr. Butterfield is (650) 324-1832.
What is Dr. Karen L. Butterfield's medical license number?
Dr. Butterfield holds California license G69715.
What medical group is Dr. Karen L. Butterfield part of?
Dr. Butterfield is linked to Palo Alto Foundation Medical Group.
Does Dr. Karen L. Butterfield accept Medicare?
Yes. CMS data shows Dr. Butterfield billed Medicare for 62 services in 2024.
How many Medicare patients does Dr. Karen L. Butterfield see?
CMS counts 70 Medicare patients who saw Dr. Butterfield in 2024, with an average age of 78.
Is Dr. Karen L. Butterfield board certified?
Yes. Dr. Butterfield is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Karen L. Butterfield bill to Medicare?
In 2024, Dr. Butterfield's most billed Medicare services were office visit, established patient (99215) and office visit, established patient (99214).
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Where did Dr. Karen L. Butterfield go to medical school?
Dr. Butterfield graduated from Stanford University School Of Medicine in 1988.
What drugs does Dr. Karen L. Butterfield prescribe most?
In 2024 Medicare Part D data, Dr. Butterfield's most prescribed drugs by claims were Losartan Potassium and Amlodipine Besylate.
Has Dr. Karen L. Butterfield received payments from drug or device companies?
CMS Open Payments shows $120 in general payments to Dr. Butterfield from 1 company from 2017 to 2017. The largest total came from Boehringer Ingelheim Pharmaceuticals, Inc.
How long has Dr. Karen L. Butterfield been practicing?
Dr. Butterfield graduated from medical school in 1988, 38 years ago.
What insurance does Dr. Karen L. Butterfield accept?
Dr. Butterfield is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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