Costochondritis ICD-10 Code: M94.0 Billing Guide

Costochondritis often shows up in the chart looking a lot like a cardiac event on paper — chest wall pain, sometimes radiating, sometimes worse with breathing. Here's the correct code, and why the workup around it matters as much as the diagnosis code itself.

Costochondritis is a benign inflammatory condition at the junction where the ribs meet the cartilage connecting to the sternum, and it's coded distinctly from general rib or chest pain once confirmed.

The Code: M94.0

M94.0 ("Chondrocostal junction syndrome," which includes Tietze's syndrome and costal chondritis) is the billable ICD-10-CM code for costochondritis. It sits outside the general R07 chest pain family entirely, in the musculoskeletal chapter, since costochondritis is a confirmed inflammatory diagnosis rather than a symptom code.

Why It's Easy to Miscode

Because costochondritis frequently presents with symptoms that overlap with cardiac chest pain, it's common for a claim's diagnostic workup (EKG, cardiac enzymes, chest imaging) to be billed under a general chest pain code like R07.9 while the visit is still in the rule-out phase — and then never updated to M94.0 once the diagnosis is actually confirmed. Coders should confirm whether the final assessment in the note supports moving from a symptom code to the confirmed M94.0 diagnosis.

Distinguishing From Rib Pain (R07.89)

Costochondritis and general rib pain are frequently confused in documentation. The distinguishing clinical detail is reproducible tenderness specifically at the costochondral or costosternal joints on palpation — if that's documented and consistent with costochondritis, M94.0 is the more accurate code. If the pain doesn't localize to those specific joints or the diagnosis is genuinely undetermined, R07.89 remains appropriate.

Common CPT Pairings

Because costochondritis is frequently a diagnosis of exclusion, the workup often includes an EKG (93000) and sometimes a chest X-ray (71046) to rule out cardiac or pulmonary causes before landing on the musculoskeletal diagnosis, alongside the office visit E/M code itself.

Documentation That Supports M94.0

Strong documentation for M94.0 describes palpation findings at the costochondral joints specifically, notes that the pain reproduces with pressure on the affected area, and — particularly on the first visit — documents that cardiac causes were considered and appropriately ruled out or are being monitored.

Get a free practice audit and we'll review how your current coding workflow handles diagnosis-of-exclusion conditions like costochondritis, from initial workup through final coded diagnosis.

Frequently Asked Questions

Is M94.0 billable? Yes, M94.0 is a billable, specific ICD-10-CM code.

Does M94.0 cover Tietze syndrome too? Yes, Tietze syndrome is included under M94.0 along with costochondritis and costal chondritis, though Tietze syndrome specifically involves visible swelling, which some providers document separately.

Can costochondritis be billed alongside an EKG? Yes, when the documentation supports that cardiac causes were being appropriately ruled out as part of the diagnostic workup.

Is costochondritis considered a chronic condition for coding purposes? Not inherently — M94.0 doesn't specify acuity, so it can be used for both an initial acute presentation and recurring episodes, based on the clinical documentation.

What's the risk of leaving a claim coded to R07.9 after costochondritis is confirmed? It understates the specificity of the diagnosis and can create inconsistency in the patient's problem list and future claims if not corrected once the diagnosis is confirmed.