Dr. Thomas R. Klein, MD
- Medicare services, 2021
- 85
- Part D claims, 2024
- 98
- Hospital affiliations
- 1
- Industry payments
- $74,134
- Medical group
- 1
- Practice address
- 911 Sunset Drive, Hollister, CA 95032
- Practice phone
- Call (831) 637-5711
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Klein'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. Thomas R. Klein is an adult medicine physician in Hollister, California
Dr. Klein practices at Hazel Hawkins Memorial Hospital in Hollister, California, part of Hazel Hawkins.
Dr. Klein's NPI, 1588776017, was assigned on August 31, 2006. Dr. Klein holds Illinois license 036059654.
- NPI
- 1588776017NPI Registry (opens in a new tab)
- NPI enumeration date
- August 31, 2006
- NPI status
- Active
- Practice phone
- (831) 637-5711
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Thomas R. Klein practices at Hazel Hawkins Memorial Hospital in Hollister, California
Dr. Klein's primary practice is Hazel Hawkins Memorial Hospital, at 911 Sunset Drive, Hollister, CA 95032 in Santa Clara County. The practice phone is (831) 637-5711.
- Hazel Hawkins Memorial Hospital911 Sunset Drive, Hollister, CA 95032 · Santa Clara CountyPhone(831) 637-5711
Source: Dmand AI Affiliation Data
Dr. Thomas R. Klein is affiliated with 2 sites of care and 1 medical group
Dr. Klein's primary practice is Hazel Hawkins Memorial Hospital in Hollister, California, part of Hazel Hawkins. Dmand AI also links Dr. Klein to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas R. Klein's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Klein practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hazel Hawkins Memorial Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Hazel Hawkins and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Thomas R. Klein is one of 299 adult medicine physicians in California
Adult medicine is Dr. Klein's primary specialty in the NPI Registry, under taxonomy code 207QA0505X. Dr. Klein is licensed in Illinois.
Specialties and state licenses
- Adult medicine, IllinoisPrimary
Adult medicine physicians near Dr. Klein
Counts of adult 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. Thomas R. Klein billed Medicare for 85 services in 2021
CMS data shows 85 Medicare services from Dr. Klein across 3 procedure codes in 2021. Medicare paid $5,646 for them. Every service was in an office.
Dr. Klein's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 2662021: 7074%
- Other services
- 2020: 1782021: 1592%
- Tests and treatments
- 2020: 522021: 0100%
Dr. Klein compared with the California median for adult medicine physicians, 2021
- Dr. Klein
- California median
- Medicare services
- 85vs 19957% below
- Part D claims
- 54vs 96394% below
Medians across 284 adult medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Klein's 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. Klein and other adult medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas R. Klein's patients have a median age of 64
Across all payers, Dmand AI patient panel data puts Dr. Klein's median patient age at 64, with 29% women.
Dr. Klein's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women29%
- Men70%
Source: Dmand AI Patient Panel Data
Dr. Thomas R. Klein wrote 98 Medicare Part D claims in 2024
In 2024, Dr. Klein wrote 98 Medicare Part D claims for 12 patients. 91% of them were for generic drugs. CMS names the drug for 54 of them, across 4 drugs with 11 or more claims each, at $1,070 in total drug cost. In 2021, CMS named 2,840 claims across 79 drugs.
Dr. Klein's Part D claims by kind of drug, 2024
- Generic89 claims91%
- Brand-name and other9 claims9%
Dr. Klein's most prescribed drugs by claims, 2022
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, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 2,8402022: 5498%
Drugs named by CMS: 4 in 2022, 79 in 2021.
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. Thomas R. Klein received $74,134 in industry payments from 2016 to 2022
CMS Open Payments shows 176 general payments to Dr. Klein from 7 drug and device companies from 2016 to 2022. Speaker and faculty fees make up the largest share, 67% of the total. Gilead Sciences, Inc. paid the most, $72,959.
General payments to Dr. Klein by program year, 2016 to 2022
General payments to Dr. Klein by kind, 2016 to 2022
- Speaker and faculty fees$49,87167%
- Consulting fees$10,73014%
- Travel and lodging$8,72412%
- Food and beverage$4,5716%
- Education$2380%
Companies that paid Dr. Klein the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Thomas R. Klein'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 Data |
| 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) |
| 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. Thomas R. Klein
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. Thomas R. Klein's NPI number?
Dr. Thomas R. Klein's NPI number is 1588776017. It was assigned on August 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas R. Klein?
Dr. Thomas R. Klein is an adult medicine physician in Hollister, California. The primary specialty in the NPI Registry is Adult Medicine Physician (taxonomy code 207QA0505X).
Where does Dr. Thomas R. Klein practice?
Dr. Klein practices at 911 Sunset Drive, Hollister, CA 95032. Dr. Klein's primary practice is Hazel Hawkins Memorial Hospital in Hollister, California, part of Hazel Hawkins. Dmand AI also links Dr. Klein to 1 group practice or clinic and 1 medical group.
What is Dr. Thomas R. Klein's office phone number?
The practice phone on file for Dr. Klein is (831) 637-5711.
What is Dr. Thomas R. Klein's medical license number?
Dr. Klein holds Illinois license 036059654.
Which hospitals is Dr. Thomas R. Klein affiliated with?
Dr. Klein practices at Hazel Hawkins Memorial Hospital in Hollister, California.
Does Dr. Thomas R. Klein accept Medicare?
Yes. CMS data shows Dr. Klein billed Medicare for 85 services in 2021.
What services does Dr. Thomas R. Klein bill to Medicare?
In 2021, Dr. Klein's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and medicare service (G0439).
What drugs does Dr. Thomas R. Klein prescribe most?
In 2022 Medicare Part D data, Dr. Klein's most prescribed drugs by claims were Amlodipine Besylate, Finasteride and Risperidone.
Has Dr. Thomas R. Klein received payments from drug or device companies?
CMS Open Payments shows $74,134 in general payments to Dr. Klein from 7 companies from 2016 to 2022. The largest total came from Gilead Sciences, Inc.
How long has Dr. Thomas R. Klein been practicing?
Dr. Klein's NPI was assigned in 2006.
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