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ICD-10 Guide
ICD-10 CodesA51.44

A51.44

Secondary syphilitic nephritis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 A51.44 is a billable code used to indicate a diagnosis of secondary syphilitic nephritis.

Key Diagnostic Point:

Secondary syphilitic nephritis is a renal complication associated with secondary syphilis, a sexually transmitted infection caused by the bacterium Treponema pallidum. This condition arises when the syphilis infection disseminates through the bloodstream, leading to inflammation and damage in the kidneys. Clinically, patients may present with symptoms such as hematuria, proteinuria, and renal impairment. The diagnosis is often confirmed through serological testing for syphilis, including non-treponemal tests (e.g., RPR, VDRL) and treponemal tests (e.g., FTA-ABS). Treatment typically involves the administration of benzathine penicillin G, which is effective in eradicating the infection and preventing further renal damage. Contact tracing is crucial in managing syphilis, as it helps identify and treat sexual partners, thereby reducing transmission rates. Regular follow-up and monitoring of renal function are recommended to assess recovery and manage any potential complications.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of sexually transmitted infections and their complications.
  • Involves knowledge of renal pathology related to syphilis.
  • Documentation must clearly link nephritis to syphilis diagnosis.
  • Potential for misclassification with other types of nephritis.

Audit Risk Factors

  • Inadequate documentation linking nephritis to syphilis.
  • Failure to include serological test results in the medical record.
  • Misdiagnosis or coding of nephritis without syphilis confirmation.
  • Lack of follow-up documentation on renal function.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed history of syphilis infection, treatment plans, and follow-up care.

Common Clinical Scenarios

Patients presenting with secondary syphilis and renal symptoms.

Billing Considerations

Ensure all serological tests and treatment regimens are documented.

Nephrology

Documentation Requirements

Comprehensive renal function tests, imaging studies, and treatment responses.

Common Clinical Scenarios

Patients with renal impairment attributed to secondary syphilis.

Billing Considerations

Document any renal biopsies or advanced imaging that may be performed.

Coding Guidelines

Inclusion Criteria

Use A51.44 When
  • According to ICD
  • 10 coding guidelines, A51
  • 44 should be used when there is clear documentation of nephritis as a complication of secondary syphilis
  • It is important to ensure that the diagnosis is supported by appropriate laboratory findings and clinical documentation

Exclusion Criteria

Do NOT use A51.44 When
No specific exclusions found.

Related CPT Codes

86592CPT Code

Syphilis serology test

Clinical Scenario

Used when testing for syphilis in patients with renal symptoms.

Documentation Requirements

Document the reason for testing and results.

Specialty Considerations

Infectious disease specialists should ensure comprehensive testing.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like secondary syphilitic nephritis, improving the accuracy of data collection and reimbursement processes. It emphasizes the importance of detailed documentation linking infections to complications.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like secondary syphilitic nephritis, improving the accuracy of data collection and reimbursement processes. It emphasizes the importance of detailed documentation linking infections to complications.

Reimbursement & Billing Impact

reimbursement processes. It emphasizes the importance of detailed documentation linking infections to complications.

Resources

Clinical References

  • •
    CDC Syphilis Fact Sheet

Coding & Billing References

  • •
    CDC Syphilis Fact Sheet

Frequently Asked Questions

What are the common symptoms of secondary syphilitic nephritis?

Common symptoms include hematuria, proteinuria, and signs of renal impairment such as elevated blood pressure and changes in urine output.

How is secondary syphilitic nephritis treated?

Treatment typically involves the administration of benzathine penicillin G, along with monitoring renal function and managing any complications.

What is the importance of contact tracing in syphilis?

Contact tracing is crucial to identify and treat sexual partners, reducing the risk of further transmission and complications associated with syphilis.