Dr. Richard K. Lessman, MD
- Medicare services, 2022
- 5,341
- Part D claims, 2024
- 42
- Industry payments
- $868
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 227 W Janss Rd Ste 115, Thousand Oaks, CA 91360
- Practice phone
- Call (805) 496-6071
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Fresenius Kidney Care Thousand Oaks
Dialysis Center - Independent · Thousand Oaks, California
Find Dr. Lessman'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. Richard K. Lessman is a nephrologist in West Hollywood, California
Dr. Lessman practices at Fresenius Kidney Care Thousand Oaks in Thousand Oaks, California.
Dr. Lessman's NPI, 1073513263, was assigned on July 28, 2005. Dr. Lessman graduated from David Geffen School of Medicine at UCLA in 1978. Dr. Lessman holds California license A23840.
- NPI
- 1073513263NPI Registry (opens in a new tab)
- NPI enumeration date
- July 28, 2005
- NPI status
- Active
- Practice phone
- (805) 496-6071
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Richard K. Lessman practices in Thousand Oaks and West Hollywood
Dr. Lessman's primary practice is Fresenius Kidney Care Thousand Oaks, at 227 W Janss Rd Ste 115, Thousand Oaks, CA 91360 in Ventura County. The practice phone is (805) 496-6071. The NPI Registry lists Dr. Lessman's practice address as 8700 Beverly Blvd, West Hollywood, CA 90048.
- Fresenius Kidney Care Thousand OaksPrimary227 W Janss Rd Ste 115, Thousand Oaks, CA 91360 · Ventura CountyPhone(805) 496-6071
- NPI Registry address8700 Beverly Blvd, West Hollywood, CA 90048 · Los Angeles CountyPhone(805) 496-6051
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Richard K. Lessman is affiliated with 1 site of care and 1 medical group
Dr. Lessman's primary practice is Fresenius Kidney Care Thousand Oaks in Thousand Oaks, California. Dmand AI also links Dr. Lessman to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Richard K. Lessman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lessman practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fresenius Kidney Care Thousand Oaks | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Richard K. Lessman is one of 1,401 nephrologists in California
Nephrology is Dr. Lessman's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Lessman is board certified in internal medicine by the American Board of Internal Medicine. Dr. Lessman is licensed in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Nephrologists near Dr. Lessman
Counts of nephrologists 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. Richard K. Lessman billed Medicare for 5,341 services in 2022
CMS data shows 5,341 Medicare services from Dr. Lessman across 5 procedure codes in 2022. Medicare paid $23,174 for them. Every service was in an office.
Dr. Lessman's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Drugs given in the office
- 2021: 25,5262022: 5,00080%
- Office and hospital visits
- 2021: 8552022: 24272%
- Lab and pathology
- 2021: 2812022: 5082%
- Tests and treatments
- 2021: 3932022: 4988%
Dr. Lessman compared with the California median for nephrologists, 2022
- Dr. Lessman
- California median
- Medicare services
- 5,341vs 1,0844.9 times
- Part D claims
- 706vs 95526% below
Medians across 1,355 nephrologists in California with Dmand AI profiles that report each measure.
Dr. Lessman's most billed Medicare procedure codes, 2022
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. Lessman and other nephrologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Richard K. Lessman's patients have a median age of 79
Across all payers, Dmand AI patient panel data puts Dr. Lessman's median patient age at 79, with 67% women.
Dr. Lessman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 79
Patient panel by sex, all payers
- Women67%
- Men29%
Source: Dmand AI Patient Panel Data
Dr. Richard K. Lessman wrote 42 Medicare Part D claims in 2024
In 2024, Dr. Lessman wrote 42 Medicare Part D claims. 81% of them were for generic drugs. They cover 26 drugs, with $21,920 in total drug cost. In 2021, CMS named 1,302 claims across 39 drugs.
Dr. Lessman's Part D claims by kind of drug, 2024
- Generic34 claims81%
- Brand-name and other8 claims19%
Dr. Lessman'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: 1,3022022: 70646%
Drugs named by CMS: 26 in 2022, 39 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. Richard K. Lessman received $868 in industry payments from 2016 to 2019
CMS Open Payments shows 16 general payments to Dr. Lessman from 3 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 98% of the total. Amgen Inc. paid the most, $689.
General payments to Dr. Lessman by program year, 2016 to 2019
General payments to Dr. Lessman by kind, 2016 to 2019
- Food and beverage$85098%
- Education$192%
Companies that paid Dr. Lessman 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. Richard K. Lessman graduated from David Geffen School of Medicine at UCLA
Dr. Lessman graduated from David Geffen School of Medicine at UCLA in 1978.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Richard K. Lessman accepts plans from 7 insurance carriers
Dr. Lessman is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Massachusetts and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Humana
- Molina
- Regence Health Plans
Plan types Dr. Lessman accepts, by number of carriers
- Medicare7
- PPO6
- HMO2
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Richard K. Lessman'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand 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) |
| 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. Richard K. Lessman
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. Richard K. Lessman's NPI number?
Dr. Richard K. Lessman's NPI number is 1073513263. It was assigned on July 28, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Richard K. Lessman?
Dr. Richard K. Lessman is a nephrologist in West Hollywood, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Richard K. Lessman practice?
Dr. Lessman practices at 227 W Janss Rd Ste 115, Thousand Oaks, CA 91360. Dr. Lessman also practices at 8700 Beverly Blvd, West Hollywood, CA 90048. Dr. Lessman's primary practice is Fresenius Kidney Care Thousand Oaks in Thousand Oaks, California. Dmand AI also links Dr. Lessman to 1 medical group.
What is Dr. Richard K. Lessman's office phone number?
The practice phone on file for Dr. Lessman is (805) 496-6071.
What is Dr. Richard K. Lessman's medical license number?
Dr. Lessman holds California license A23840.
Does Dr. Richard K. Lessman accept Medicare?
Yes. CMS data shows Dr. Lessman billed Medicare for 5,341 services in 2022.
Is Dr. Richard K. Lessman board certified?
Yes. Dr. Lessman is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Richard K. Lessman bill to Medicare?
In 2022, Dr. Lessman's most billed Medicare services were injected or infused drug (J1756), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Richard K. Lessman go to medical school?
Dr. Lessman graduated from David Geffen School of Medicine at UCLA in 1978.
What drugs does Dr. Richard K. Lessman prescribe most?
In 2022 Medicare Part D data, Dr. Lessman's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Levothyroxine Sodium.
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Has Dr. Richard K. Lessman received payments from drug or device companies?
CMS Open Payments shows $868 in general payments to Dr. Lessman from 3 companies from 2016 to 2019. The largest total came from Amgen Inc.
How long has Dr. Richard K. Lessman been practicing?
Dr. Lessman graduated from medical school in 1978, 48 years ago.
What insurance does Dr. Richard K. Lessman accept?
Dr. Lessman is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Massachusetts and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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