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Dr. Michael Lee Ditmars, MD
NPI1265440101PAC ID1951399849
- Part D claims, 2026
- 102
- Publications
- 3
- Hospital affiliations
- 1
- Medical groups
- 3
- Insurance carriers
- 7
- Practice address
- 360 Rush Dr, San Marcos, CA 92078
- Practice phone
- Call (760) 528-6295
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Ditmars' 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 Lee Ditmars is a general surgeon in San Marcos, California
Dr. Ditmars practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente.
Dr. Ditmars' NPI, 1265440101, was assigned on August 4, 2006. Dr. Ditmars graduated from UCSF School of Medicine in 1993. Dr. Ditmars holds California license G080207.
NPI and contact details
- NPI
- 1265440101NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1951399849
- NPI enumeration date
- August 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (760) 528-6295
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Lee Ditmars practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California
Dr. Ditmars' primary practice is Kaiser Permanente San Marcos Medical Center, at 360 Rush Dr, San Marcos, CA 92078 in San Diego County. The practice phone is (760) 528-6295.
- Kaiser Permanente San Marcos Medical Center360 Rush Dr, San Marcos, CA 92078 · San Diego CountyPhone(760) 528-6295
Source: Dmand AI Affiliation Data
Dr. Michael Lee Ditmars is affiliated with 3 sites of care and 3 medical groups
Dr. Ditmars' primary practice is Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Ditmars to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Southern California Permanente Medical Group2 group practices and clinicsNames with a free account2 medical groupsNames with a free account
See all 6 affiliations for Dr. DitmarsSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Lee Ditmars' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ditmars practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente San Marcos Medical Center | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Michael Lee Ditmars is one of 2,926 general surgeons in California
Surgery is Dr. Ditmars' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Ditmars is board certified in surgery by the American Board of Surgery. Dr. Ditmars is licensed in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
General surgeons near Dr. Ditmars
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
2,926general surgeons in California
7general surgeons in San Marcos
7general surgeons at Kaiser Permanente San Marcos Medical CenterSources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael Lee Ditmars' patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Dr. Ditmars' median patient age at 60, with 71% women.
Dr. Ditmars' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women71%
- Men29%
Source: Dmand AI Patient Panel Data
Dr. Michael Lee Ditmars wrote 102 Medicare Part D claims in 2026
In 2026, Dr. Ditmars wrote 102 Medicare Part D claims for 59 patients. 100% of them were for generic drugs. CMS names the drug for 84 of them, across 3 drugs with 11 or more claims each, at $610 in total drug cost. In 2023, CMS named 100 claims across 4 drugs.
Part D claims, 2026102
Drugs named by CMS3
Total drug cost$610
Part D patients59
Dr. Ditmars' 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.
Drug classes CMS tracks in Dr. Ditmars' Part D claims, 2026
- Opioids53%54 of 102 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1002024: 8416%
Drugs named by CMS: 3 in 2024, 4 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), 2026 data
How Dr. Michael Lee Ditmars takes part in Medicare
Dr. Ditmars accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Michael Lee Ditmars has 3 publications on record
Dmand AI links 3 papers to Dr. Ditmars.
Papers3
Recent publications by Dr. Ditmars
Accidents, TrafficAneurysm, FalseCarotid Arteries
See who Dr. Ditmars researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ditmars works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael Lee Ditmars has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Ditmars, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Ditmars
- 2011
- CMS Stage 1 2012
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Michael Lee Ditmars graduated from UCSF School of Medicine
Dr. Ditmars graduated from UCSF School of Medicine in 1993. Dr. Ditmars is a member of ACS.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Michael Lee Ditmars accepts plans from 7 insurance carriers
Dr. Ditmars is in network with 7 carriers, including Elevance, Kaiser Permanente and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Elevance
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Ditmars accepts, by number of carriers
- Medicare6
- PPO5
- EPO2
- HMO2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Lee Ditmars'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 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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 |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Michael Lee Ditmars
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 Lee Ditmars' NPI number?
Dr. Michael Lee Ditmars' NPI number is 1265440101. It was assigned on August 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Lee Ditmars?
Dr. Michael Lee Ditmars is a general surgeon in San Marcos, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Michael Lee Ditmars practice?
Dr. Ditmars practices at 360 Rush Dr, San Marcos, CA 92078. Dr. Ditmars' primary practice is Kaiser Permanente San Marcos Medical Center in San Marcos, California, part of Kaiser Permanente. Dmand AI also links Dr. Ditmars to 2 group practices and clinics and 2 medical groups, and a free account names each one.
What is Dr. Michael Lee Ditmars' office phone number?
The practice phone on file for Dr. Ditmars is (760) 528-6295. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Michael Lee Ditmars' email address?
Dmand AI checks professional and personal email addresses for Dr. Ditmars through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Michael Lee Ditmars' medical license number?
Dr. Ditmars holds California license G080207.
Which hospitals is Dr. Michael Lee Ditmars affiliated with?
Dr. Ditmars practices at Kaiser Permanente San Marcos Medical Center in San Marcos, California.
What medical group is Dr. Michael Lee Ditmars part of?
Dr. Ditmars is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Ditmars to 2 more medical groups, named with a free account.
Who does Dr. Michael Lee Ditmars practice with?
Dmand AI links 17,030 HCPs to Dr. Ditmars' primary medical group, 280 of them general surgeons. A free account lists them, with verified contacts.
Does Dr. Michael Lee Ditmars accept Medicare?
Yes. CMS lists Dr. Ditmars as accepting Medicare assignment.
Show 7 more questionsShow fewer questions
Is Dr. Michael Lee Ditmars board certified?
Yes. Dr. Ditmars is board certified in surgery by the American Board of Surgery.
Where did Dr. Michael Lee Ditmars go to medical school?
Dr. Ditmars graduated from UCSF School of Medicine in 1993.
What drugs does Dr. Michael Lee Ditmars prescribe most?
In 2024 Medicare Part D data, Dr. Ditmars' most prescribed drugs by claims were Meloxicam, Tramadol HCl and Hydrocodone-Acetaminophen.
How long has Dr. Michael Lee Ditmars been practicing?
Dr. Ditmars graduated from medical school in 1993, 33 years ago.
Does Dr. Michael Lee Ditmars do research?
Dmand AI links 3 publications to Dr. Ditmars.
What EHR does Dr. Michael Lee Ditmars' practice use?
Dmand AI tracks the EHR system at Kaiser Permanente San Marcos Medical Center and at 2 more sites and 2 medical groups. The vendor and product are available with a free Dmand AI account.
What insurance does Dr. Michael Lee Ditmars accept?
Dr. Ditmars is in network with 7 carriers, including Elevance, Kaiser Permanente and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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