R57.9
BillableShock, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is R57.9 an HCC code?
Yes. R57.9 maps to Cardio-Respiratory Failure and Shock under the CMS-HCC V28 risk adjustment model (and Cardio-Respiratory Failure and Shock under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for R57.9
For R57.9 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed R57.9 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
R57.9 is the ICD-10-CM diagnosis code for shock, unspecified. A life-threatening condition with dangerously low blood pressure where the specific cause has not been identified or documented. R57.9 sits in the ICD-10-CM chapter for symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (r00-r99), within the section covering general symptoms and signs (r50-r69).
Under the CMS-HCC V28 risk adjustment model, R57.9 maps to Cardio-Respiratory Failure and Shock (HCC 213) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, R57.9 mapped to the same category but with a base RAF weight of 0.402 — V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This is a default code; use only when the type of shock cannot be determined from documentation. Because R57.9 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for R57.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a default code; use only when the type of shock cannot be determined from documentation
- •Review records carefully to identify the underlying cause and use a more specific shock code if possible
Clinical Significance
Unspecified shock represents a life-threatening hemodynamic emergency requiring immediate intervention and intensive monitoring. While this code lacks specificity about etiology, it indicates severe circulatory compromise that significantly impacts mortality risk and resource utilization.
Documentation Requirements
- ✓Blood pressure readings showing hypotension
- ✓Clinical signs of poor perfusion
- ✓Laboratory values indicating organ dysfunction
- ✓Response to fluid resuscitation
- ✓Vasopressor or inotrope requirements
- ✓Underlying cause investigation results
- ✓ICU level care documentation
- ✓Serial hemodynamic monitoring