Dr. Michael K. Jefferson, MD
- Medicare services, 2024
- 40,325
- Medicare patients, 2024
- 564
- Part D claims, 2024
- 1,023
- MIPS score, 2024
- 75
- Hospital affiliations
- 2
- Practice address
- 215 W Janss Rd, Thousand Oaks, CA 91360
- Practice phone
- Call (805) 497-2727
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Jefferson'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. Michael K. Jefferson is an anesthesiologist in Thousand Oaks, California
Dr. Jefferson practices at Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare.
Dr. Jefferson's NPI, 1689649469, was assigned on February 23, 2006. Dr. Jefferson graduated from Hahnemann University College of Medicine in 1984. Dr. Jefferson holds California license G68903.
- NPI
- 1689649469NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294734687
- NPI enumeration date
- February 23, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 497-2727
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael K. Jefferson practices at Los Robles Regional Medical Center in Thousand Oaks, California
Dr. Jefferson's primary practice is Los Robles Regional Medical Center, at 215 W Janss Rd, Thousand Oaks, CA 91360 in Ventura County. The practice phone is (805) 497-2727.
- Los Robles Regional Medical Center215 W Janss Rd, Thousand Oaks, CA 91360 · Ventura CountyPhone(805) 497-2727
Source: Dmand AI Affiliation Data
Dr. Michael K. Jefferson is affiliated with 4 sites of care and 2 medical groups
Dr. Jefferson's primary practice is Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare. Dr. Jefferson is also affiliated with Adventist Health Glendale. The medical group on file is Conejo Los Robles Anesthesiology Medical Group (CLRAMG). Dmand AI also links Dr. Jefferson to 1 more physician office, 1 home health agency 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. Michael K. Jefferson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Jefferson practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Los Robles Regional Medical Center | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael K. Jefferson is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Jefferson's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Jefferson is licensed in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Anesthesiologists near Dr. Jefferson
Counts of anesthesiologists 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. Michael K. Jefferson billed Medicare for 40,325 services in 2024
CMS data shows 40,325 Medicare services from Dr. Jefferson across 26 procedure codes in 2024, for 564 Medicare patients. Medicare paid $499,341 for them.
Dr. Jefferson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 02024: 37,505
- Office and hospital visits
- 2023: 1,2762024: 87232%
- Tests and treatments
- 2023: 1,8612024: 73760%
- Imaging
- 2023: 1,4472024: 69152%
- Surgery
- 2023: 6572024: 35047%
- Anesthesia
- 2023: 742024: 170130%
Where Dr. Jefferson's Medicare services took place, 2024
- In an office40,155100%
- In a facility1700%
Dr. Jefferson compared with the California median for anesthesiologists, 2024
- Dr. Jefferson
- California median
- Medicare services
- 40,325vs 72560.1 times
- Medicare patients
- 564vs 1433.9 times
- Part D claims
- 746vs 2332.4 times
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Dr. Jefferson'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. Jefferson?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Jefferson and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael K. Jefferson treated 564 Medicare patients in 2024, average age 73
CMS counts 564 Medicare patients who saw Dr. Jefferson in 2024. The largest group is 65 to 74, with 243 patients. 75% of them have arthritis, and 75% have high blood pressure. 61% are also on Medicaid. Their average risk score is 2.47, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Jefferson's median patient age at 67, with 54% women.
Dr. Jefferson's Medicare patients by age, 2024
Dr. Jefferson's Medicare patients by sex, 2024
- Women27749%
- Men28751%
Chronic conditions among Dr. Jefferson's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Diabetes66%
- Ischemic heart disease63%
- Mood disorders58%
- Depression56%
- COPD46%
Share of Medicare patients with each condition. A patient can have several.
Dr. Jefferson's 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
- Women54%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael K. Jefferson wrote 1,023 Medicare Part D claims in 2024
In 2024, Dr. Jefferson wrote 1,023 Medicare Part D claims for 22 patients. 90% of them were for generic drugs. CMS names the drug for 746 of them, across 37 drugs with 11 or more claims each, at $168,096 in total drug cost. In 2023, CMS named 211 claims across 13 drugs.
Dr. Jefferson's Part D claims by kind of drug, 2024
- Generic923 claims90%
- Brand-name86 claims8%
- Other14 claims1%
Dr. Jefferson'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: 2112024: 746254%
Drugs named by CMS: 37 in 2024, 13 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
Dr. Michael K. Jefferson scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Jefferson for performance year 2024, reported individually. Dr. Jefferson accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
- MIPS final score, 2024
- 75 of 100
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Michael K. Jefferson received $730 in industry payments from 2016 to 2024
CMS Open Payments shows 32 general payments to Dr. Jefferson from 5 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Biosense Webster, Inc. paid the most, $559.
General payments to Dr. Jefferson by program year, 2016 to 2024
Companies that paid Dr. Jefferson the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael K. Jefferson graduated from Hahnemann University College of Medicine
Dr. Jefferson graduated from Hahnemann University College of Medicine in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael K. Jefferson'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (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. Michael K. Jefferson
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. Michael K. Jefferson's NPI number?
Dr. Michael K. Jefferson's NPI number is 1689649469. It was assigned on February 23, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael K. Jefferson?
Dr. Michael K. Jefferson is an anesthesiologist in Thousand Oaks, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Michael K. Jefferson practice?
Dr. Jefferson practices at 215 W Janss Rd, Thousand Oaks, CA 91360. Dr. Jefferson's primary practice is Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare. Dmand AI also links Dr. Jefferson to 1 physician office, 1 home health agency and 1 medical group.
What is Dr. Michael K. Jefferson's office phone number?
The practice phone on file for Dr. Jefferson is (805) 497-2727.
What is Dr. Michael K. Jefferson's medical license number?
Dr. Jefferson holds California license G68903.
Which hospitals is Dr. Michael K. Jefferson affiliated with?
Dr. Jefferson practices at Los Robles Regional Medical Center in Thousand Oaks, California. Dr. Jefferson is also affiliated with Adventist Health Glendale.
What medical group is Dr. Michael K. Jefferson part of?
Dr. Jefferson is linked to Conejo Los Robles Anesthesiology Medical Group (CLRAMG). Dmand AI links Dr. Jefferson to 1 more medical group.
Does Dr. Michael K. Jefferson accept Medicare?
Yes. CMS data shows Dr. Jefferson billed Medicare for 40,325 services in 2024, and Dr. Jefferson accepts Medicare assignment.
What is Dr. Michael K. Jefferson's MIPS score?
Dr. Jefferson's MIPS final score for performance year 2024 is 75 out of 100, reported individually.
How many Medicare patients does Dr. Michael K. Jefferson see?
CMS counts 564 Medicare patients who saw Dr. Jefferson in 2024, with an average age of 73.
Show 5 more questionsShow fewer questions
What services does Dr. Michael K. Jefferson bill to Medicare?
In 2024, Dr. Jefferson's most billed Medicare services were injected or infused drug (J0585), office visit, established patient (99213) and ultrasound (76881).
Where did Dr. Michael K. Jefferson go to medical school?
Dr. Jefferson graduated from Hahnemann University College of Medicine in 1984.
What drugs does Dr. Michael K. Jefferson prescribe most?
In 2024 Medicare Part D data, Dr. Jefferson's most prescribed drugs by claims were Omeprazole-Sodium Bicarbonate, Amlodipine Besylate and Citalopram HBr.
Has Dr. Michael K. Jefferson received payments from drug or device companies?
CMS Open Payments shows $730 in general payments to Dr. Jefferson from 5 companies from 2016 to 2024. The largest total came from Biosense Webster, Inc.
How long has Dr. Michael K. Jefferson been practicing?
Dr. Jefferson graduated from medical school in 1984, 42 years ago.
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