K67 ICD-10-CM Code: Disorders of peritoneum in infectious diseases classified elsewhere
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 / Diseases of the digestive system (K00-K95) / Diseases of peritoneum and retroperitoneum (K65-K68)
K67
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDisorders of peritoneum in infectious diseases classified elsewhere
Inflammation or infection of the peritoneum (the lining around abdominal organs) caused by an infectious disease classified elsewhere in the medical record.
Buddy Insight
This code represents peritoneal complications secondary to infectious diseases classified elsewhere, requiring dual coding to capture both the underlying infection and peritoneal involvement.
CMS-HCC V28
MappedHCC 78
RAF 0.0
CMS-HCC V24
MappedHCC 33
RAF 0.226
ACA/HHS
00
RAF 0
ESRD/PACE
MappedHCC 33
RAF 0.0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for K67 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for K67 in this effective period.
Related Child Codes
ICD-10-CM does not list child codes under K67 for this display context.
Includes
OfficialICD-10-CM does not list Includes notes for K67 in this effective period.
Excludes 1
Official- peritonitis in chlamydia (A74.81)
- peritonitis in diphtheria (A36.89)
- peritonitis in gonococcal (A54.85)
- peritonitis in syphilis (late) (A52.74)
- peritonitis in tuberculosis (A18.31)
Code First
Official- underlying disease, such as:
- congenital syphilis (A50.0)
- helminthiasis (B65.0 -B83.9)
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for K67 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for K67 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is K67 an HCC code?
Yes. K67 maps to Intestinal Obstruction/Perforation under the CMS-HCC V28 risk adjustment model (and Intestinal Obstruction/Perforation 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 K67
For K67to 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 K67 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
K67 is the ICD-10-CM diagnosis code for disorders of peritoneum in infectious diseases classified elsewhere. Inflammation or infection of the peritoneum (the lining around abdominal organs) caused by an infectious disease classified elsewhere in the medical record. K67 sits in the ICD-10-CM chapter for diseases of the digestive system (k00-k95), within the section covering diseases of peritoneum and retroperitoneum (k65-k68).
Under the CMS-HCC V28 risk adjustment model, K67 maps to Intestinal Obstruction/Perforation (HCC 78) with a community, non-dual, aged base RAF weight of 0.000. Under the older V24 model, K67 mapped to the same category but with a base RAF weight of 0.226, 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 code requires a secondary code to identify the underlying infectious disease causing the peritoneal disorder. Because K67 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 K67 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code requires a secondary code to identify the underlying infectious disease causing the peritoneal disorder
- •Use this code when the peritoneal involvement is a manifestation of another classified infectious condition
Clinical Significance
This code represents peritoneal complications secondary to infectious diseases classified elsewhere, requiring dual coding to capture both the underlying infection and peritoneal involvement. The condition indicates systemic infection with abdominal complications, necessitating aggressive treatment of both conditions.
Documentation Requirements
- ✓Documentation of peritoneal disorder/inflammation
- ✓Clear identification of underlying infectious disease
- ✓Evidence linking peritoneal condition to the infection
- ✓Coding of primary infectious disease elsewhere
- ✓Clinical manifestations of both conditions
- ✓Treatment addressing both infectious and peritoneal components
- ✓Provider assessment of causal relationship
- ✓Exclusion of primary peritonitis diagnoses
Excludes 1, Do NOT code together
Commonly Confused Codes
- •K65.0: Primary acute peritonitis not secondary to other infections
- •K65.9: Unspecified peritonitis without identified infectious cause
- •A41.9: Primary sepsis code should be sequenced first
- •B99: Other infectious diseases require specific organism coding
- •K68.19: Retroperitoneal abscess is anatomically distinct