A02.24 ICD-10-CM Code: Salmonella osteomyelitis
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)
A02.24
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceSalmonella osteomyelitis
A bone infection caused by Salmonella bacteria, which is a type of food-borne pathogen that can spread through the bloodstream and infect the bone tissue. This condition causes inflammation, pain, and potential bone damage if left untreated.
Buddy Insight
Salmonella osteomyelitis is a bone infection caused by non-typhi Salmonella species, classically associated with sickle cell disease where it is the most common cause of osteomyelitis.
CMS-HCC V28
MappedHCC 92
RAF 0.479
CMS-HCC V24
MappedHCC 39
RAF 0.401
ACA/HHS
MappedHCC 55
Varies by metal level
ESRD/PACE
MappedHCC 39
RAF 0.092
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A02.24 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A02.24 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A02.24 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A02.24 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A02.24 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A02.24 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A02.24 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is A02.24 an HCC code?
Yes. A02.24 (Salmonella osteomyelitis) maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis under the CMS-HCC V28 risk adjustment model (and Bone/Joint/Muscle Infections/Necrosis under V24), with a community non-dual aged RAF of 0.479. It is billable for payment year 2026.
Coder answer: A02.24 is billable and maps to V28 HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- A02.24
- Description
- Salmonella osteomyelitis
- HCC (V28)
- HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
- RAF
- 0.479
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. 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.
Work A02.24 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for A02.24
For A02.24 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 A02.24 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
A02.24 is the ICD-10-CM diagnosis code for salmonella osteomyelitis. A bone infection caused by Salmonella bacteria, which is a type of food-borne pathogen that can spread through the bloodstream and infect the bone tissue. This condition causes inflammation, pain, and potential bone damage if left untreated. A02.24 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).
Under the CMS-HCC V28 risk adjustment model, A02.24 maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (HCC 92) with a community, non-dual, aged base RAF weight of 0.479. Under the older CMS-HCC V24 model, A02.24 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 39) with a community, non-dual, aged base RAF weight of 0.401. 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.
Verify the specific bone site affected and use an additional code from category M86 if needed to specify the anatomical location (e.g., femur, tibia, humerus). Because A02.24 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 A02.24 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific bone site affected and use an additional code from category M86 if needed to specify the anatomical location (e.g., femur, tibia, humerus)
- •Confirm the diagnosis is documented as Salmonella osteomyelitis and not another type of bacterial osteomyelitis, as this distinction is important for treatment and epidemiological tracking
Clinical Significance
Salmonella osteomyelitis is a bone infection caused by non-typhi Salmonella species, classically associated with sickle cell disease where it is the most common cause of osteomyelitis. It requires prolonged antibiotic therapy and may need surgical intervention, representing substantial healthcare resource utilization.
Documentation Requirements
- ✓Bone culture or blood culture identifying Salmonella species with radiographic evidence of bone involvement
- ✓MRI, bone scan, or CT imaging confirming osteomyelitis
- ✓Specific bone(s) and anatomic location(s) affected
- ✓Acuity — acute vs. chronic osteomyelitis
- ✓Underlying risk factors documented (sickle cell disease, immunosuppression, prosthetic hardware)
Commonly Confused Codes
- •A01.05 (Typhoid osteomyelitis): Use A01.05 for S. typhi bone infections; A02.24 is for non-typhi Salmonella species
- •M86.9 (Osteomyelitis, unspecified): Use A02.24 when Salmonella is the documented organism, not the generic osteomyelitis code
- •M86.60 (Other chronic osteomyelitis, unspecified site): A02.24 is the correct code when the organism is identified as Salmonella