ICD-10 Code D73.5: Infarction of spleen

Key Takeaways

ICD-10 Code D73.5 is a billable, specific diagnosis code for infarction of spleen, valid for FY2026 under the D50-D89 chapter.

Inclusion terms cover splenic rupture (nontraumatic) and torsion of spleen, but NOT traumatic splenic injuries, which use the S36.0x series.

Always sequence the underlying etiology (atrial fibrillation, sickle cell disease, hypercoagulable state) as the principal diagnosis when it drives the encounter.

Pabau’s claims management software and AI-assisted documentation help practices capture D73.5 accurately and reduce claim errors at submission.

ICD-10 Code D73.5 is the billable, specific ICD-10-CM code for infarction of spleen, covering nontraumatic splenic rupture and torsion of spleen as inclusion terms. It is valid for FY2026 and is usually sequenced as a secondary code, following the underlying etiology that drove the encounter. Pabau’s claims management software keeps ICD-10 codes tied directly to patient records, reducing errors at submission.

ICD-10 Code D73.5: Definition and clinical description

D73.5 sits within Chapter 3 (Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism, D50-D89), under the block D70-D77 (Other disorders of blood and blood-forming organs), and within the parent category D73 (Diseases of spleen). The code has been valid and billable every fiscal year from 2016 through FY2026, as confirmed by the CDC/NCHS ICD-10-CM web tool.

Splenic infarction occurs when blood supply to the spleen is interrupted, causing tissue death in the affected region. Clinically, it presents as acute left upper quadrant pain, sometimes radiating to the left shoulder, and is associated with fever, nausea, and elevated inflammatory markers.

The condition is typically discovered on CT imaging and most commonly arises as a complication of hematologic disease, thromboembolic events, or structural cardiac conditions.

Inclusion terms and what D73.5 covers

Two additional conditions are captured under D73.5 as inclusion terms in the official tabular list. Both are nontraumatic splenic conditions and must not be confused with injury codes.

• Splenic rupture, nontraumatic: Spontaneous rupture of the spleen occurring without external physical force, often as a complication of splenomegaly, infection, or hematologic malignancy. Significant blood loss can lead to acute posthemorrhagic anemia.
• Torsion of spleen: Rotation of the spleen on its vascular pedicle, compromising blood flow and causing ischemia. Most common in wandering spleen (an anatomic variant).

Coders and clinicians should verify these inclusion terms against the official tabular list maintained by the Centers for Medicare and Medicaid Services (CMS). The inclusion terms do not expand the code’s scope; they clarify equivalent conditions that map to the same code. Accurate clinical documentation distinguishing among these presentations is essential before the code is assigned.

What D73.5 does NOT cover

Traumatic splenic injuries are explicitly outside the scope of D73.5. Blunt abdominal trauma causing splenic laceration, rupture, or contusion is coded using the S36.0x series under Chapter 19 (Injury, poisoning, and certain other consequences of external causes). Applying D73.5 to a traumatic rupture is a coding error that may trigger a claim audit.

Similarly, other diseases of the spleen listed under D73 have their own specific codes and should not default to D73.5. For instance, splenic abscess maps to D73.3, and cyst of spleen maps to D73.4.

D73.5 classification hierarchy and related codes

Understanding where D73.5 sits within the ICD-10-CM hierarchy helps coders navigate the full D73 category and select the most specific code available. The WHO ICD-10 browser provides the authoritative classification structure.

Coders handling other hematologic disorders can reference our guide to ICD-10 Code D69.3 (immune thrombocytopenic purpura) for parallel sequencing logic. When D73.9 (unspecified) is tempting because documentation is incomplete, the better path is to query the provider before assigning a non-specific code.

ICD-9-CM crosswalk for D73.5

Practices transitioning legacy data, supporting audits on historical claims, or working with older EHR records will encounter ICD-9-CM codes. The crosswalk for splenic infarction maps as follows:

• ICD-9-CM 289.59: Other diseases of spleen (this was the closest equivalent for infarction of spleen in the legacy system)
• ICD-9-CM 865.01: Injury to spleen without open wound (used for traumatic rupture, which is a separate category from D73.5)

The ICD-10-CM system introduced substantially more granularity for splenic conditions. D73.5 replaced a broader ICD-9 bucket code that grouped multiple splenic conditions together. For consistent mapping, coders should verify legacy crosswalks against the official General Equivalence Mappings (GEMs) rather than relying on memory.

Documentation requirements for D73.5

Insufficient documentation is the primary reason D73.5 claims face payer scrutiny. Coders cannot assign a code that the clinical record does not support, and “splenic infarction” must appear as a confirmed diagnosis, not a rule-out or differential.

The clinical record must include all of the following to support D73.5:

• Confirmed diagnosis statement: The attending physician must explicitly document “infarction of spleen,” “splenic infarction,” “nontraumatic splenic rupture,” or “torsion of spleen.” A radiologist’s impression alone does not suffice unless co-signed or adopted by the treating clinician.
• Imaging findings: CT of the abdomen with contrast is the standard modality. The report should describe the wedge-shaped or geographic hypodense area consistent with infarction.
• Etiology documentation: The underlying cause (atrial fibrillation, sickle cell disease, hypercoagulable state, vasculitis, myeloproliferative disorder) must be separately documented and coded. This drives sequencing decisions.
• Clinical correlation statement: The provider should connect imaging findings to clinical presentation (left upper quadrant pain, fever, elevated LDH) in the assessment and plan.

Practices using digital intake forms to capture presenting symptoms systematically reduce the risk of incomplete documentation at the point of first contact. When the ICD-10 coding workflow is embedded in the EHR, coders work from structured notes rather than hunting through unorganized free text.

Dedicated clinical documentation software makes that structure routine, which matters when a payer requests medical records to support a D73.5 claim.

Billing and sequencing guidelines for ICD-10 Code D73.5

D73.5 is almost always a secondary code. The principal diagnosis should reflect the underlying condition driving the encounter. ICD-10-CM Official Guidelines from the National Center for Health Statistics (NCHS) direct coders to sequence the etiology first when it is known and documented.

Common principal diagnoses coded alongside D73.5 include:

• I48.x (Atrial fibrillation and flutter): Cardioembolic infarction of the spleen is a recognized complication of atrial fibrillation. When AF is the cause, it leads the claim.
• D57.x (Sickle cell disorders): Splenic infarction and functional asplenia are well-documented sequelae of sickle cell disease. D57 codes are the principal diagnosis.
• D47.x (Other neoplasms of uncertain behavior of lymphoid, hematopoietic, and related tissue): Myeloproliferative disorders can drive splenic vascular occlusion.
• M31.x (Other necrotizing vasculopathies): Vasculitic conditions affecting the splenic vasculature require the vasculitis code as the primary diagnosis.
• D68.x (Other coagulation defects): Hypercoagulable states are coded here and should precede D73.5 on the claim; a related coagulation disorder is disseminated intravascular coagulation (D65).

When the etiology is not yet identified and the encounter is specifically for splenic infarction, D73.5 may serve as the principal diagnosis. However, the documentation must clearly state that no underlying cause was identified at the time of the encounter. Understanding accurate ICD-10-CM sequencing principles for primary versus secondary positioning helps avoid errors across all diagnostic categories, not just splenic conditions.

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Common coding errors with D73.5

Three errors account for the majority of D73.5 claim problems. Each is preventable with tighter documentation workflows and coder education.

Using D73.5 for traumatic splenic injury

Traumatic splenic rupture following motor vehicle accidents, falls, or sports injuries does not belong under D73.5. The correct codes are in the S36.0x series (injury to spleen). Applying D73.5 to a trauma encounter will typically be flagged by claims editing software because the principal diagnosis codes (trauma, injury) do not logically associate with a non-traumatic splenic code.

Payer systems look for clinical coherence across the claim. Practices concerned about HIPAA-compliant documentation workflows should ensure their coding audit trails clearly distinguish traumatic from non-traumatic presentations.

Coding from the radiology report alone

A CT report that reads “findings consistent with splenic infarction” is not a physician-confirmed diagnosis. ICD-10-CM guidelines require the attending or treating physician to document the diagnosis. If only the radiologist’s report exists, the coder should query the physician before assigning D73.5. Failure to do this creates exposure during retrospective audits.

Omitting the underlying etiology code

Coding D73.5 alone on a claim where the underlying cause is documented and known is an incomplete code set. Payers expect to see the etiological chain. Missing the principal diagnosis can trigger a request for additional documentation or outright denial. The sequencing rules are clear: etiology first, manifestation (splenic infarction) second.

EHR workflow tips for capturing D73.5 accurately

Accurate code capture starts at the clinical encounter, not the billing queue. When clinicians document in structured fields rather than free text, coders spend less time interpreting ambiguous notes and more time on quality review. Practices using practice management software features that integrate diagnosis code selection directly with the clinical note see fewer incomplete records at claim creation.

Specific workflow improvements that support D73.5 accuracy:

• Structured problem list: Include confirmed diagnoses with ICD-10 codes in the problem list, not just in the assessment narrative. This creates a coded audit trail separate from free-text notes.
• Diagnosis query templates: Create standardized physician query templates for cases where imaging suggests splenic infarction but documentation is incomplete. Coders should not assign the code without explicit confirmation.
• Etiology linking: Use EHR fields that allow the coder to link D73.5 to the principal diagnosis code during claim creation. This forces the sequencing decision at the point of billing rather than as an afterthought.
• AI-assisted clinical documentation: Tools such as AI-assisted clinical documentation capture structured clinical data during consultations, reducing the risk of key diagnostic details being lost in free-text entries.

For practices managing multiple specialty workflows, functional medicine practices dealing with autoimmune or hematologic presentations encounter D73.5 in the context of broader multisystem workups. Having a consistent coding protocol for secondary diagnosis codes across these complex encounters reduces variability in claim accuracy.

Conclusion

Splenic infarction presents a specific coding challenge: a condition that almost always has an underlying cause, that must be distinguished from traumatic injury, and that requires explicit physician documentation before the code can be assigned. ICD-10 Code D73.5 covers infarction of spleen, nontraumatic splenic rupture, and torsion of spleen. It is a secondary code in most encounters, following the principal diagnosis of the underlying etiology.

Pabau supports accurate ICD-10 Code D73.5 capture through structured clinical records, integrated diagnosis code workflows, and AI-assisted documentation that ensures key details are never lost between the clinical encounter and claim submission. To see how practice management software works to streamline diagnostic coding workflows, book a demo.

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