A51.5
BillableEarly syphilis, latent
Early syphilis, latent
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.
Includes
Conditions included under this code
- diseases generally recognized as communicable or transmissible
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- certain localized infections - see body system-related chapters
- •nonspecific and nongonococcal urethritisN34.1
- •Reiter's diseaseM02.3
Excludes 2
Conditions not included here, but the patient may have both
- •carrier or suspected carrier of infectious diseaseZ22
- •infectious and parasitic diseases complicating pregnancy, childbirth and the puerperiumO98
- •infectious and parasitic diseases specific to the perinatal periodP35-P39
- •influenza and other acute respiratory infectionsJ00-J22
- •human immunodeficiency virus [HIV] diseaseB20
Use Additional Code
Additional codes that should follow this code
Related Codes(6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(31)
SNOMED CT
- Early latent syphilis, positive serology, negative cerebrospinal fluid, with relapse after treatment1107004
- Early latent syphilis, positive serology, negative cerebrospinal fluid, less than 2 years after infection31137003
- Latent syphilis (+ sero.)67125004
- Latent syphilis with positive serology67125004
- Latent early syphilis186867005
- Serological relapse after treatment of latent early syphilis186868000
- Acquired syphilis240555007
- Acquired syphilis - early latent266130009
- Latent syphilis444150000
UMLS
- Early Latent SyphilisC0275842
- Early latent syphilis, positive serology, negative cerebrospinal fluid, less than 2 years after infectionC0275842
- Early latent syphilis, positive serology, negative cerebrospinal fluid, less than 2 years after infection (disorder)C0275842
- Early syphilis, latentC0275842
- Early syphilis, latent, unspecifiedC0275842
- Latent early syphilisC0275842
- Latent early syphilis (disorder)C0275842
- Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.C2893339
Clinical Terms
- Early latent syphilis, positive serology, negative cerebrospinal fluid, less than 2 years after infection
- Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.
- Latent early syphilis
- Early latent syphilis, positive serology, negative cerebrospinal fluid, less than 2 years after infection (disorder)
- Latent early syphilis (disorder)
- Serological relapse after treatment of latent early syphilis
- Latent syphilis with positive serology
- Acquired syphilis - early latent
- Latent syphilis
- Latent syphilis (+ sero.)
- Early Latent Syphilis
- Early syphilis, latent, unspecified
- Early latent syphilis, positive serology, negative cerebrospinal fluid, with relapse after treatment
- Acquired syphilis
Frequently Asked Questions
What is the ICD-10 code for early syphilis, latent?
The ICD-10-CM code for early syphilis, latent is A51.5. The full clinical description is "Early syphilis, latent". A51.5 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code A51.5 mean?
ICD-10-CM code A51.5 represents “Early syphilis, latent”. It is classified under Chapter 1: Certain Infectious and Parasitic Diseases and is a billable/specific code that can be used on a claim.
Is A51.5 a billable code?
Yes, A51.5 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is A51.5 in?
A51.5 is in Chapter 1: Certain Infectious and Parasitic Diseases (codes A00-B99).
What codes cannot be used with A51.5?
A51.5 has Excludes1 notes indicating codes that cannot be used together with it, including: certain localized infections - see body system-related chapters; nonspecific and nongonococcal urethritis (N34.1); Reiter's disease (M02.3-).
Are additional codes required with A51.5?
Yes, when using A51.5, also report: resistance to antimicrobial drugs (Z16.-).
What SNOMED CT codes does A51.5 map to?
A51.5 maps to 8 SNOMED CT concepts: 240555007, 266130009, 31137003, 1107004, 186867005, and 3 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for A51.5?
A51.5 is linked to 2 UMLS Concept Unique Identifiers: C0275842, C2893339. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does A51.5 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like early syphilis, latent affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of A51.5?
A51.5 maps to the ICD-11 code: 1A61.5 (Latent early syphilis).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.