Dr. Michael Lee Ditmars , MD
Surgery • Antioch, CA
3903 Lone Tree Way, Suite 210
Antioch, CA 945096249
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on August 4, 2006; this date does not establish years in practice.
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Published CMS data list 84 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Meloxicam — 34 prescription fills, including refills.
- Tramadol Hcl — 29 prescription fills, including refills.
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 21 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 65% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: 54. Middle half: 26 to 105.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part D prescriptions went from 39 in 2020 to 84 in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020–2024.
Practice Location & Contact Primary Location
3903 Lone Tree Way
Suite 210
Antioch, CA 945096249
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Southern California Permanente Medical Group. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of California, San Francisco School Of Medicine
1993
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
84 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$610 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
Years since graduation
33 years (graduated 1993)
CMS Doctors and Clinicians data list 1993 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Ditmars has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Ditmars as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Antioch and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
More Part D prescriptions than 65% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: 54. Middle half: 26 to 105.
Too few clinicians listed under Surgery in Antioch have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 60% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: $346. Middle half: $126 to $1,126.
Too few clinicians listed under Surgery in Antioch have Medicare Part D data for 2024 to compare.
8 active clinicians are listed under Surgery with a practice address in Antioch, CA (3,120 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 115% from 39 in 2020 to 84 in 2024.
- 2020: 39
- 2021: 51
- 2022: 70
- 2023: 100
- 2024: 84
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30-day fills
30-day fills increased 115% from 39 in 2020 to 84 in 2024.
- 2020: 39
- 2021: 51
- 2022: 70
- 2023: 100
- 2024: 84
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Part D drug cost
Part D drug cost went from $380 in 2020 to $610 in 2024.
- 2020: $380
- 2021: $462
- 2022: $627
- 2023: $754
- 2024: $610
Sources: CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Meloxicam | Meloxicam | 34 | 523 | $203.63 | 34 |
| Tramadol Hcl | Tramadol Hcl | 29 | 136 | $181.35 | 28 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 21 | 93 | $225.33 | 19 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20040907000508
CA
1951399849
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Southern California Permanente Medical Group
360 Rush Dr, San Marcos, CA 920787901
Phone: 8335742273
Southern California Permanente Medical Group
4647 Zion Ave, San Diego, CA 921202507
Phone: 6195285000
Southern California Permanente Medical Group
400 Craven Rd, San Marcos, CA 920784201
Phone: 6195285000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Orthopaedic Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096249 (Tel: 9257570800)
Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096249 (Tel: 9257570800)
NPI status registered as active in NPPES database
Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096270 (Tel: 9257570800)
Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096270 (Tel: 9257570800)
Recorded as MICHAEL DITMARS, MD
Surgery (license number reported to NPPES: CA G080207)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Antioch
- Dr. Brent Izu, MD
- Dr. Pascal Fuchshuber, MD
- Dr. Tripurari Mishra, MD
- Dr. Christopher Solis, MD
- Dr. Phillip Polido, MD
- Dr. Joseph Brandel, MD
Mailing Address
3903 Lone Tree Way, Suite 210
Antioch, CA 945096249
Phone: 9257570800