ICD-10 code B92: Sequelae of leprosy coding guide

Key Takeaways

ICD-10 code B92 describes sequelae of leprosy – the residual conditions left after the active infection has resolved, not active leprosy itself.

B92 is a billable ICD-10-CM code valid for claims with a date of service on or after October 1, 2015.

UnitedHealthcare lists B92 as an inappropriate primary diagnosis code; it is typically sequenced as a secondary or additional code.

Pabau’s claims management software supports accurate ICD-10 sequencing and documentation workflows for infectious disease coding.

ICD-10 code B92: Definition and clinical description

Most leprosy-related claims that get flagged or denied share a common root: coders assign an active disease code when the patient’s condition is actually a residual consequence of a resolved infection. ICD-10 code B92 exists precisely for those situations. It captures the sequelae of leprosy – the lasting neurological damage, structural deformities, and skin changes that persist after the active infection is no longer present.

One SERP source (coding.health) incorrectly defines B92 as infectious mononucleosis caused by the Epstein-Barr virus. That is factually wrong. Infectious mononucleosis is coded under B27.x. B92 has a single, well-established meaning: sequelae of leprosy (Hansen’s disease). This article corrects that misinformation and provides accurate coding guidance for clinical coders and practitioners who encounter leprosy-related sequelae in their patient populations.

Sequelae of leprosy: clinical overview

Leprosy, caused by Mycobacterium leprae, is a chronic granulomatous infection primarily affecting peripheral nerves and skin. The WHO’s ICD-10 browser classifies active leprosy under A30.x within Chapter 1 (Certain Infectious and Parasitic Diseases, A00-B99). B92 sits in a different block entirely: B90-B94, which covers sequelae of infectious and parasitic diseases – meaning the infection is gone, but its effects remain.

Residual manifestations after leprosy resolution commonly include peripheral neuropathy, claw hand deformity, foot drop, lagophthalmos (inability to close the eyelid fully), and areas of anesthetic skin. These are the clinical conditions that B92 is intended to document when no active M. leprae infection is present. For practitioners working in dermatology and skin clinic software environments, distinguishing between active and post-infection states is critical for both accurate diagnosis coding and reimbursement.

Active leprosy vs. sequelae: the coding distinction

The fundamental rule: B92 applies only when the infection itself is no longer active. If the patient has a current, active leprosy infection, the correct codes are within the A30.x range (A30.0 through A30.9, by type). B92 applies when the clinician documents that leprosy has been treated or resolved, and the patient now presents with a residual condition attributable to the prior infection.

• Active leprosy (current infection): A30.x (Leprosy [Hansen’s disease])
• Residual effects after resolution: B92 (Sequelae of leprosy)
• Peripheral neuropathy as sequela: B92 as the sequela code, with an additional code for the specific neuropathic manifestation if documented

The distinction matters because payers read sequelae codes differently from active disease codes. Sequencing B92 incorrectly as a standalone primary code is the most common denial trigger for this code set, and it is addressed directly in payer policy guidance discussed later in this article.

ICD-10 code B92: classification and code details

B92 sits within a clearly defined block in the ICD-10-CM tabular list. Understanding its classification context helps coders apply it correctly and avoid sequencing errors.

The CDC/NCHS ICD-10-CM web tool provides the official U.S. tabular list for B92 and can be used to verify the code’s current validity year over year. For the 2026 code set, B92 remains active and billable with no revisions.

ICD-9-CM crosswalk: converting B92 from legacy systems

Practices migrating legacy records or processing older claims may need the ICD-9-CM equivalent. B92 converts approximately to ICD-9-CM code 139.8 (Late effects of other and unspecified infectious and parasitic diseases). This is not a perfect 1:1 crosswalk. ICD-9-CM 139.8 covered a broader range of post-infectious conditions, while ICD-10-CM B92 is leprosy-specific. When reviewing historical coding records or performing audits on pre-2015 claims, verify that 139.8 entries relate to leprosy before mapping them to B92.

The AAPC Codify ICD-10-CM lookup provides crosswalk reference data alongside code descriptors, which is useful when validating legacy conversions. The PGM Billing crosswalk tool is another resource for specialty-specific ICD-9 to ICD-10 conversions when processing mixed-era claim files.

Related ICD-10 codes in the B90-B94 sequelae block

B92 does not exist in isolation. It is one of five code entries within the B90-B94 block, each covering sequelae of a different infectious or parasitic disease. Knowing the adjacent codes helps coders avoid misassignment, particularly when the infectious origin is uncertain or the patient has a history of multiple prior infections.

The key distinction between B92 and B94.8 is documentation of the causative infection. If the record clearly identifies leprosy as the prior infection, B92 is the correct choice. If the causative infection is documented but does not have its own sequelae code in B90-B94, B94.8 applies. For sequelae of infectious conditions where the cause is genuinely uncertain, B94.9 is the appropriate fallback. Using B94.9 when B92 is clearly indicated is a documentation gap, not a coding error – but it can complicate audits.

ICD-10 code B92 documentation requirements

Sequelae coding carries specific documentation expectations that differ from active disease coding. The ICD-10-CM Official Guidelines for Coding and Reporting, maintained by the Centers for Medicare and Medicaid Services (CMS) and NCHS, provide the authoritative framework for sequelae code usage. These rules directly govern B92 assignment.

What the documentation must establish

Three elements should be present in the clinical record to support a B92 code assignment.

• History of leprosy: The record must establish that the patient had a diagnosed leprosy infection at some prior point. A prior diagnosis in the patient’s problem list, referral documentation, or prior encounter notes satisfies this requirement.
• Current residual condition: The clinician must document a current condition – such as peripheral neuropathy, claw hand, foot drop, or anesthetic skin patches – that is attributable to the prior infection.
• No active infection: The documentation should confirm (explicitly or contextually) that the current leprosy infection is resolved. If active infection is still present, A30.x is the correct code family, not B92.

Strong clinical documentation workflows reduce the risk of sequelae coding errors by ensuring that prior infection history is consistently recorded and linked to current presentations. Practices using structured EHR templates for infectious disease follow-up are better positioned to support B92 assignments during audits.

Coding sequencing for B92

Per ICD-10-CM guidelines, when a sequela code is assigned, it is generally sequenced after the code for the resulting condition. For example: if a patient presents with peripheral neuropathy resulting from prior leprosy, the neuropathy code (from G category) would typically be sequenced first as the principal diagnosis, with B92 as an additional code identifying the cause. This sequencing rule is central to the payer policy discussion in the next section.

Accurate sequencing is part of effective claims management software configuration. When EHR systems are set up to flag sequelae codes assigned as primary diagnoses without a corresponding condition code, claims errors are caught before submission rather than after denial.

Reduce coding errors with structured diagnostic workflows

Pabau helps clinics document patient history, link prior infections to current sequelae, and manage ICD-10 code assignments within a single clinical record. See how it supports accurate B92 coding.

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Payer policy: B92 as an inappropriate primary diagnosis code

UnitedHealthcare (UHC) explicitly lists B92 among the codes designated as inappropriate primary ICD-10 diagnosis codes in its published provider policy documentation. This reflects a coding principle that applies broadly to sequelae codes: they are almost never correct as the sole primary diagnosis.

The reasoning is straightforward. A sequela code identifies the cause of a current condition, not the condition itself. Submitting B92 as a standalone primary diagnosis tells the payer only that the patient has a history of leprosy – it does not communicate the clinical reason for the current encounter. That reason (the neuropathy, the deformity, the functional deficit) is what should lead the claim, with B92 providing etiological context as an additional code.

Practical denial prevention for ICD-10 code B92

Practices encountering denials on B92-coded claims should audit the claim structure before resubmission.

• Is a residual condition code sequenced first? The neuropathy, deformity, or specific functional deficit should be the principal diagnosis.
• Is B92 listed as additional/secondary? It should follow the condition code, not precede it.
• Does the clinical documentation support the sequela relationship? The chart note should link the current condition to the prior leprosy history.

Ensuring medical office compliance documentation captures the causal relationship between prior infection and current presentation is as important as the code selection itself. Payers reviewing sequelae claims often request supporting documentation – a well-structured clinical note reduces that administrative burden significantly.

For practices managing HIPAA-compliant clinical documentation across multiple providers, configuring EHR alerts for sequelae code sequencing rules is a cost-effective way to prevent recurring denials without relying on individual coder memory.

EHR workflow tips for sequelae of leprosy diagnosis coding

Accurate ICD-10 code B92 assignment starts at the point of documentation, not the billing queue. EHR configuration choices made during practice setup significantly affect how reliably sequelae codes get applied correctly at scale.

Template and problem list configuration

Adding resolved leprosy to a patient’s problem list with an explicit “resolved” or “history of” status creates the documentation anchor that B92 requires. Templates for follow-up encounters in infectious disease or dermatology should include a structured field for prior infectious diagnoses, with a free-text line for the clinician to describe current residual findings.

Digital intake forms that capture patient-reported history of tropical or infectious diseases can surface prior leprosy diagnoses before the encounter, giving the clinician and coder the information they need without relying on patient recall during the visit itself.

ICD-10-CM lookup tools for B92

For coders who need to verify B92 quickly, the ICD List provides free ICD-10-CM lookup with DRG grouper integration, code edits, and approximate synonym listings. It mirrors official CMS/NCHS data and is a reliable reference for confirming code descriptors, crosswalks, and adjacent codes in the B90-B94 block.

Protecting patient diagnosis records throughout the coding and billing process is also a compliance consideration, particularly for conditions like leprosy where stigma historically affected disclosure. Ensuring that diagnostic data is handled within a secure, role-restricted system reduces risk for both the patient and the practice.

Practices managing ICD-10 neurological condition coding for sequelae-related neuropathic presentations will find the same sequelae sequencing rules apply across B90-B94 – the principle established here for B92 carries across the entire block.

Conclusion

Sequelae coding errors on B92 claims nearly always come down to one mistake: assigning the code as a standalone primary diagnosis instead of using it to support a leading residual condition code. ICD-10 code B92 documents the cause, not the encounter reason.

Pabau’s claims management software helps practices configure sequencing rules, document infectious disease history in structured clinical records, and flag B92 sequelae assignments that appear in primary position before a claim is submitted. If you want to see how Pabau supports accurate ICD-10 documentation workflows, book a demo.

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