Other spirochetal infections (A69) ICD-10-CM
The A69 code range covers other spirochetal infections with 11 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the A69 Range 11 codes · 9 billable
- A69 Other spirochetal infectionsNon-billable
- A69.0 Necrotizing ulcerative stomatitis
- A69.1 Other Vincent's infections
- A69.2 Lyme diseaseNon-billable
- A69.20 Lyme disease, unspecified
- A69.21 Meningitis due to Lyme disease
- A69.22 Other neurologic disorders in Lyme disease
- A69.23 Arthritis due to Lyme disease
- A69.29 Other conditions associated with Lyme disease
- A69.8 Other specified spirochetal infections
- A69.9 Spirochetal infection, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A69 range.
Borrelia burgdorferi
A specific species of bacteria, part of the BORRELIA BURGDORFERI GROUP, whose common name is Lyme disease spirochete.
Borrelia burgdorferi Group
Gram-negative helical bacteria, in the genus BORRELIA, that are the etiologic agents of LYME DISEASE. The group comprises many specific species including Borrelia afzelii, Borellia garinii, and BORRELIA BURGDORFERI proper. These spirochetes are generally transmitted by several species of ixodid ticks.
Lyme Disease
An infectious disease caused by a spirochete, BORRELIA BURGDORFERI, which is transmitted chiefly by Ixodes dammini (see IXODES) and pacificus ticks in the United States and Ixodes ricinis (see IXODES) in Europe. It is a disease with early and late cutaneous manifestations plus involvement of the nervous system, heart, eye, and joints in variable combinations. The disease was formerly known as Lyme arthritis and first discovered at Old Lyme, Connecticut.
Lyme Disease Vaccines
Vaccines or candidate vaccines used to prevent LYME DISEASE.
Lyme Neuroborreliosis
Nervous system infections caused by tick-borne spirochetes of the BORRELIA BURGDORFERI GROUP. The disease may affect elements of the central or peripheral nervous system in isolation or in combination. Common clinical manifestations include a lymphocytic meningitis, cranial neuropathy (most often a facial neuropathy), POLYRADICULOPATHY, and a mild loss of memory and other cognitive functions. Less often more extensive inflammation involving the central nervous system (encephalomyelitis) may occur. In the peripheral nervous system, B. burgdorferi infection is associated with mononeuritis multiplex and polyradiculoneuritis. (From J Neurol Sci 1998 Jan 8;153(2):182-91)
Post-Lyme Disease Syndrome
A condition caused by long-lasting and ongoing infection with the spirochete Borrelia burgdorferi resulting in progressive inflammatory neurologic, neuromuscular, and dermatologic manifestations including ENCEPHALITIS; MYELITIS; acrodermatitis chronica atrophicans; and ARTHRITIS.
About the A69 Code Range
The ICD-10 code A69 and its subcodes are used to classify various spirochetal infections, which are infections caused by spiral-shaped bacteria. This section covers conditions like necrotizing ulcerative stomatitis, Vincent's infections, and multiple manifestations of Lyme disease, including neurologic, joint, and other systemic effects.
Necrotizing ulcerative stomatitis (A69.0), also known as cancrum oris or noma neonatorum, involves severe tissue destruction in the mouth. Other Vincent's infections (A69.1) include ulcerative conditions such as ulcerative gingivitis and Vincent's angina, caused by Fusobacterium bacteria affecting gums and throat. The Lyme disease codes (A69.2 and subcodes) identify different presentations of Lyme disease, from unspecified cases (A69.20) to meningitis (A69.21), neurological disorders (A69.22), and arthritis (A69.23). Other related Lyme conditions (A69.29) address less common symptoms like ocular or cardiac involvement. The section also includes codes for other specified spirochetal infections (A69.8) and unspecified cases (A69.9). Understanding these codes, including synonyms like Lyme neuroborreliosis or necrotizing ulcerative gingivitis, helps healthcare professionals accurately document and treat spirochetal infections.
Questions About This Page
How many billable codes are in the A69 range?
Of the 11 codes in this range, 9 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A69 range classify?
The range classifies other spirochetal infections. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
