Dr. Catharine Teresa Clark-Sayles, MD
- Medicare services, 2019
- 1,006
- Part D claims, 2020
- 89
- Publications
- 5
- Industry payments
- $3,282
- State license
- 1
- Practice address
- 300 Pasteur Dr, Stanford, CA 94305
- Practice phone
- Call (415) 464-8176
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Clark-Sayles' professional email, personal email and mobile number
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Dr. Catharine Teresa Clark-Sayles is an internist in Stanford, California
Dr. Clark-Sayles practices in Stanford, California.
Dr. Clark-Sayles' NPI, 1518952860, was assigned on September 13, 2005. Dr. Clark-Sayles graduated from University of Colorado Anschutz Medical Campus in 1979. Dr. Clark-Sayles holds California license G49182.
- NPI
- 1518952860NPI Registry (opens in a new tab)
- NPI enumeration date
- September 13, 2005
- NPI status
- Active
- Practice phone
- (415) 464-8176
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Catharine Teresa Clark-Sayles' practice address is in Stanford, California
Dr. Clark-Sayles' practice address in the NPI Registry is 300 Pasteur Dr, Stanford, CA 94305, in Santa Clara County. The practice phone is (415) 464-8176.
- NPI Registry address300 Pasteur Dr, Stanford, CA 94305 · Santa Clara CountyPhone(415) 464-8176
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Catharine Teresa Clark-Sayles' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Clark-Sayles practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Clark-Sayles' practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Catharine Teresa Clark-Sayles is one of 16,751 internists in California
Internal medicine is Dr. Clark-Sayles' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Clark-Sayles is board certified in internal medicine by the American Board of Internal Medicine. Dr. Clark-Sayles is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Clark-Sayles
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. Catharine Teresa Clark-Sayles billed Medicare for 1,006 services in 2019
CMS data shows 1,006 Medicare services from Dr. Clark-Sayles across 11 procedure codes in 2019. Medicare paid $61,943 for them. Every service was in an office.
Dr. Clark-Sayles' Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 1,2082019: 72340%
- Tests and treatments
- 2018: 3572019: 14161%
- Other services
- 2018: 3412019: 10470%
- Drugs given in the office
- 2018: 612019: 3838%
- Lab and pathology
- 2018: 322019: 0100%
- Surgery
- 2018: 242019: 0100%
Dr. Clark-Sayles compared with the California median for internists, 2019
- Dr. Clark-Sayles
- California median
- Medicare services
- 1,006vs 3612.8 times
- Part D claims
- 89vs 42179% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Clark-Sayles' most billed Medicare procedure codes, 2019
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. Clark-Sayles?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Clark-Sayles and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Catharine Teresa Clark-Sayles' patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Clark-Sayles' median patient age at 71, with 56% women.
Dr. Clark-Sayles' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women56%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Catharine Teresa Clark-Sayles wrote 89 Medicare Part D claims in 2020
In 2020, Dr. Clark-Sayles wrote 89 Medicare Part D claims. They cover 5 drugs, with $1,612 in total drug cost. In 2019, CMS named 3,448 claims across 99 drugs.
Dr. Clark-Sayles' most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 3,4482020: 8997%
Drugs named by CMS: 5 in 2020, 99 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Catharine Teresa Clark-Sayles has 5 publications on record
Dmand AI links 5 papers to Dr. Clark-Sayles.
Recent publications by Dr. Clark-Sayles
See who Dr. Clark-Sayles researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Clark-Sayles works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Catharine Teresa Clark-Sayles received $3,282 in industry payments from 2016 to 2019
CMS Open Payments shows 191 general payments to Dr. Clark-Sayles from 32 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $422.
General payments to Dr. Clark-Sayles by program year, 2016 to 2019
Companies that paid Dr. Clark-Sayles the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Catharine Teresa Clark-Sayles has 3 awards and honors on record
Dmand AI lists 3 awards for Dr. Clark-Sayles, most recently Regional Top Doctor in 2014.
Awards and honors for Dr. Clark-Sayles
- 2014
- Regional Top Doctor
- 2012
- FACP
- Undated
- Checkbook Top Doc
Source: Dmand AI Professional Profile Data
Dr. Catharine Teresa Clark-Sayles graduated from University of Colorado Anschutz Medical Campus
Dr. Clark-Sayles graduated from University of Colorado Anschutz Medical Campus in 1979.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Catharine Teresa Clark-Sayles'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 |
| 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. Catharine Teresa Clark-Sayles
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. Catharine Teresa Clark-Sayles' NPI number?
Dr. Catharine Teresa Clark-Sayles' NPI number is 1518952860. It was assigned on September 13, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Catharine Teresa Clark-Sayles?
Dr. Catharine Teresa Clark-Sayles is an internist in Stanford, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Catharine Teresa Clark-Sayles practice?
Dr. Clark-Sayles practices at 300 Pasteur Dr, Stanford, CA 94305.
What is Dr. Catharine Teresa Clark-Sayles' office phone number?
The practice phone on file for Dr. Clark-Sayles is (415) 464-8176.
What is Dr. Catharine Teresa Clark-Sayles' medical license number?
Dr. Clark-Sayles holds California license G49182.
Does Dr. Catharine Teresa Clark-Sayles accept Medicare?
Yes. CMS data shows Dr. Clark-Sayles billed Medicare for 1,006 services in 2019.
Is Dr. Catharine Teresa Clark-Sayles board certified?
Yes. Dr. Clark-Sayles is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Catharine Teresa Clark-Sayles bill to Medicare?
In 2019, Dr. Clark-Sayles' most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, established patient (99212).
Where did Dr. Catharine Teresa Clark-Sayles go to medical school?
Dr. Clark-Sayles graduated from University of Colorado Anschutz Medical Campus in 1979.
What drugs does Dr. Catharine Teresa Clark-Sayles prescribe most?
In 2020 Medicare Part D data, Dr. Clark-Sayles' most prescribed drugs by claims were Levothyroxine Sodium, Atorvastatin Calcium and Lisinopril.
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Has Dr. Catharine Teresa Clark-Sayles received payments from drug or device companies?
CMS Open Payments shows $3,282 in general payments to Dr. Clark-Sayles from 32 companies from 2016 to 2019. The largest total came from Amgen Inc.
How long has Dr. Catharine Teresa Clark-Sayles been practicing?
Dr. Clark-Sayles graduated from medical school in 1979, 47 years ago.
Does Dr. Catharine Teresa Clark-Sayles do research?
Dmand AI links 5 publications to Dr. Clark-Sayles.
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