Dr. Donald Richard Knotts, MD
- Medicare services, 2021
- 174
- Part D claims, 2021
- 1,187
- Industry payments
- $29
- Affiliated sites
- 1
- State license
- 1
- Practice address
- 20130 Lake Chabot Rd, Castro Valley, CA 94546-5340
- Practice phone
- Call (510) 886-3701
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Donald R. Knotts, M.D. Inc.
Physician office · Castro Valley, California
Find Dr. Knotts' 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. Donald Richard Knotts is an internist in Castro Valley, California
Dr. Knotts practices at Donald R. Knotts, M.D. Inc. in Castro Valley, California.
Dr. Knotts' NPI, 1790858611, was assigned on November 16, 2006. Dr. Knotts graduated from Saint Louis University School of Medicine in 1974. Dr. Knotts holds California license G33548.
- NPI
- 1790858611NPI Registry (opens in a new tab)
- NPI enumeration date
- November 16, 2006
- NPI status
- Active
- Practice phone
- (510) 886-3701
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 78
- Medical school graduation
- 1974
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Donald Richard Knotts practices at Donald R. Knotts, M.D. Inc. in Castro Valley, California
Dr. Knotts' primary practice is Donald R. Knotts, M.D. Inc., at 20130 Lake Chabot Rd, Castro Valley, CA 94546-5340. The practice phone is (510) 886-3701.
- Donald R. Knotts, M.D. Inc.20130 Lake Chabot Rd, Castro Valley, CA 94546-5340Phone(510) 886-3701
Source: Dmand AI Affiliation Data
Dr. Donald Richard Knotts is affiliated with 1 site of care
Dr. Knotts' primary practice is Donald R. Knotts, M.D. Inc. in Castro Valley, California.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Donald Richard Knotts' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Knotts practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Donald R. Knotts, M.D. Inc. | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Donald Richard Knotts is one of 16,751 internists in California
Internal medicine is Dr. Knotts' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Knotts is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Knotts
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. Donald Richard Knotts billed Medicare for 174 services in 2021
CMS data shows 174 Medicare services from Dr. Knotts across 5 procedure codes in 2021. Medicare paid $18,126 for them. Every service was in an office.
Dr. Knotts' Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 3002021: 15648%
- Other services
- 2020: 1032021: 1883%
- Tests and treatments
- 2020: 262021: 0100%
Dr. Knotts compared with the California median for internists, 2021
- Dr. Knotts
- California median
- Medicare services
- 174vs 36152% below
- Part D claims
- 1,187vs 4212.8 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Knotts' most billed Medicare procedure codes, 2021
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Knotts and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Donald Richard Knotts' patients have a median age of 67
Across all payers, Dmand AI patient panel data puts Dr. Knotts' median patient age at 67, with 50% women.
Dr. Knotts' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women50%
- Men46%
Source: Dmand AI Patient Panel Data
Dr. Donald Richard Knotts wrote 1,187 Medicare Part D claims in 2021
In 2021, Dr. Knotts wrote 1,187 Medicare Part D claims. They cover 37 drugs, with $48,645 in total drug cost. In 2020, CMS named 2,101 claims across 56 drugs.
Dr. Knotts' most prescribed drugs by claims, 2021
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, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 2,1012021: 1,18744%
Drugs named by CMS: 37 in 2021, 56 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Donald Richard Knotts received $29 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Knotts from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $29.
Companies that paid Dr. Knotts the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Donald Richard Knotts graduated from Saint Louis University School of Medicine
Dr. Knotts graduated from Saint Louis University School of Medicine in 1974.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Donald Richard Knotts'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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. Donald Richard Knotts
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. Donald Richard Knotts' NPI number?
Dr. Donald Richard Knotts' NPI number is 1790858611. It was assigned on November 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Donald Richard Knotts?
Dr. Donald Richard Knotts is an internist in Castro Valley, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Donald Richard Knotts practice?
Dr. Knotts practices at 20130 Lake Chabot Rd, Castro Valley, CA 94546-5340. Dr. Knotts' primary practice is Donald R. Knotts, M.D. Inc. in Castro Valley, California.
What is Dr. Donald Richard Knotts' office phone number?
The practice phone on file for Dr. Knotts is (510) 886-3701.
What is Dr. Donald Richard Knotts' medical license number?
Dr. Knotts holds California license G33548.
Does Dr. Donald Richard Knotts accept Medicare?
Yes. CMS data shows Dr. Knotts billed Medicare for 174 services in 2021.
What services does Dr. Donald Richard Knotts bill to Medicare?
In 2021, Dr. Knotts' most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, established patient (99215).
Where did Dr. Donald Richard Knotts go to medical school?
Dr. Knotts graduated from Saint Louis University School of Medicine in 1974.
What drugs does Dr. Donald Richard Knotts prescribe most?
In 2021 Medicare Part D data, Dr. Knotts' most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Levothyroxine Sodium.
Has Dr. Donald Richard Knotts received payments from drug or device companies?
CMS Open Payments shows $29 in general payments to Dr. Knotts from 1 company from 2021 to 2021. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Donald Richard Knotts been practicing?
Dr. Knotts graduated from medical school in 1974, 52 years ago.
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