Quick answers
- Does John J. Tiedeken accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Tiedeken accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does John J. Tiedeken see?
- In 2024, CMS data shows 169 Original Medicare patients and 1,872 services for John J. Tiedeken. This counts Original Medicare only and measures volume, not quality.
- What is John J. Tiedeken's NPI number?
- 1770703902. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for John J. Tiedeken, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 169 |
|---|---|
| Services billed to Medicare | 1,872 |
| Different services or procedures | 34 |
| Participating Medicare provider | Yes |
| Average age of these patients | 80 |
Most frequent services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)557 services
- Removal of skin and tissue, 20.0 sq cm or less (11042)481 services
- Removal of skin and tissue, each additional 20.0 sq cm or less (11045)180 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)120 services
- Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes (99305)79 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease56%
- Diabetes54%
- Heart failure54%
- Arthritis50%
Practice locations
Addresses where John J. Tiedeken is enrolled with Medicare (CMS data updated October 2, 2026).
- 1900 Coffee RdModesto, CA 95355 (209) 526‑1775
Group practices
Medicare enrollment lists John J. Tiedeken as a member of this group (CMS data updated October 2, 2026).
- Robert Marriott Medical Corp64 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Other clinicians in Robert Marriott Medical Corp
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1770703902 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians