J13
BillablePneumonia due to Streptococcus pneumoniae
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is J13 an HCC code?
Yes. J13 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess under the V24 model but is not retained in V28.
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 J13
For J13to 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 J13 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
J13 is the ICD-10-CM diagnosis code for pneumonia due to streptococcus pneumoniae. Pneumonia caused by Streptococcus pneumoniae bacteria, a common cause of bacterial pneumonia. J13 sits in the ICD-10-CM chapter for diseases of the respiratory system (j00-j99), within the section covering influenza and pneumonia (j09-j18).
Under the older CMS-HCC V24 model, J13 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess (HCC 115) with a community, non-dual, aged base RAF weight of 0.339. 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.
No additional characters needed; this is a complete code. Because J13 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 J13 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •No additional characters needed; this is a complete code
- •Verify culture or test results confirm pneumococcal infection before coding
Clinical Significance
Pneumonia due to Streptococcus pneumoniae (pneumococcus) is a significant bacterial respiratory infection that increases morbidity, particularly in elderly and immunocompromised patients. This organism is a leading cause of community-acquired pneumonia and carries specific vaccination and treatment protocol implications. Accurate organism identification impacts treatment decisions, infection control measures, and risk stratification.
Documentation Requirements
- ✓Documentation of pneumonia diagnosis with causative organism identified as Streptococcus pneumoniae (pneumococcus)
- ✓Chest imaging (X-ray or CT) findings consistent with pneumonia
- ✓Clinical signs and symptoms documented (fever, cough, dyspnea, sputum production)
- ✓Culture, sputum, or molecular testing results confirming the specific organism
- ✓Antibiotic therapy prescribed and documented
- ✓Severity assessment (need for oxygen, hospitalization, intensive care)
Excludes 1 — Do NOT code together
Code Also
Commonly Confused Codes
- •J15.0-J15.29 — Other specified bacterial pneumonias; ensure culture confirms pneumococcus specifically
- •J18.1 — Lobar pneumonia, unspecified organism; if organism is not identified, this more general code applies
- •J14 — Pneumonia due to Hemophilus influenzae; different organism despite similar clinical presentation
- •J15.4 — Pneumonia due to other streptococci; pneumococcus is S. pneumoniae specifically, not other streptococcal species