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Dr. Michael Lee Ditmars , MD

Surgery • Antioch, CA

Active NPI 1265440101 Individual Practitioner Male Practitioner Accepts Medicare assignment
Practice location in NPPES

3903 Lone Tree Way, Suite 210
Antioch, CA 945096249

Call 9257570800 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

3903 Lone Tree Way
Suite 210

Antioch, CA 945096249

Telephone 9257570800
Fax 9257572160
Organization at the Same NPPES Address or Phone
Delta Pediatrics Medical Group, Inc. Facility NPI 1750334660

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

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

Medical School

University Of California, San Francisco School Of Medicine

Graduation Year

1993

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.

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.

Guide: How to read an Open Payments record

Years since graduation

33 years (graduated 1993)

CMS Doctors and Clinicians data list 1993 as the year this clinician finished professional 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.

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?”

Guide: What Medicare assignment means

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.

Guide: How Medicare covers telehealth

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.

Guide: What Medicare enrollment (PECOS) means

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.

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.

Guide: What ordering and referring status means

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.

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.

CMS Part D · Data Year 2024
Prescription Year:
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

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

License # reported to NPPES CA G080207

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.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Medical Board of California.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - GENERAL SURGERY

Medicare Enrollment ID

I20040907000508

Enrollment State Jurisdiction

CA

PECOS Control ID

1951399849

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

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.

4 listed
NPI 1770756884

Doctor of Medicine (M.D.)

NPI 1245320001

Doctor of Medicine (M.D.)

NPI 1013013218
Dr. Denise Romero , MD

Orthopaedic Surgery

NPI 1194922542

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

8 Historical Events
📍
Updated Practice Location December 01, 2021

Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096249 (Tel: 9257570800)

📍
Updated Business Mailing Address December 01, 2021

Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096249 (Tel: 9257570800)

âś…
NPI Profile Active January 02, 2008

NPI status registered as active in NPPES database

📍
Practice Location (Initial Record) January 02, 2008

Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096270 (Tel: 9257570800)

📍
Business Mailing Address (Initial Record) January 02, 2008

Registered at 3903 LONE TREE WAY, SUITE 210, ANTIOCH, CA 945096270 (Tel: 9257570800)

👤
Provider Name / Credentials (Initial Record) January 02, 2008

Recorded as MICHAEL DITMARS, MD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) January 02, 2008

Surgery (license number reported to NPPES: CA G080207)

🟢
Initial NPI Registration & Enumeration August 04, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1265440101
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 04, 2006
Last Update: December 01, 2021
Sole Proprietor: No

Other Surgery Specialists in Antioch

Healthcare providers in Antioch

Mailing Address

3903 Lone Tree Way, Suite 210

Antioch, CA 945096249

Phone: 9257570800

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.