M84.359K — Stress fracture, hip, unspecified, subsequent encounter for fracture with nonunion
Is M84.359K billable?
Yes, but M84.359K is an unspecified code. M84.359K is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, M84.359K is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting M84.359K — the more specific alternatives are listed below.
M84.359K at a glance
| Code | M84.359K |
|---|---|
| Description | Stress fracture, hip, unspecified, subsequent encounter for fracture with nonunion |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "K" | subsequent encounter for fracture with nonunion |
What does the 7th character "K" mean in M84.359K?
In M84.359K, the 7th character K means subsequent encounter for fracture with nonunion. The 7th character is required for M84.359K to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does M84.359K group to?
M84.359K sits in MDC 08 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 521Hip Replacement with Principal Diagnosis of Hip Fracture with MCCsurgical
- 522Hip Replacement with Principal Diagnosis of Hip Fracture without MCCsurgical
As a secondary diagnosis, M84.359K is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is M84.359K listed in the Alphabetic Index?
The Alphabetic Index lists these routes under M84.359, the nearest indexed parent of M84.359K. Use them to find the family, then select the specific code.
- Fracture, traumatic › stress › femoral neck (abduction) (adduction) (separation)
Excludes1 — never code together — inherited from M84.3
The conditions below can never be reported together with M84.359K on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from M84.3
Report an additional code alongside M84.359K to fully describe the condition. M84.359K is sequenced first.
- external cause code(s) to identify the cause of the stress fracture
Excludes2 — not included here — inherited from Chapter 13
The conditions below are not part of M84.359K, but a patient may have both at the same time. When documentation supports it, M84.359K and the excluded code may both be reported.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Excludes2 — not included here — inherited from M84
The conditions below are not part of M84.359K, but a patient may have both at the same time. When documentation supports it, M84.359K and the excluded code may both be reported.
- traumatic fracture of bone-see fracture, by site
Excludes2 — not included here — inherited from M84.3
The conditions below are not part of M84.359K, but a patient may have both at the same time. When documentation supports it, M84.359K and the excluded code may both be reported.
How long has M84.359K existed?
M84.359K has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.