Listing code
101.18
Children (Part B)
Body system
101.00
Musculoskeletal disorders (children)
Subsections
4
Lettered criteria paths
Step in evaluation
3 of 5
Listing match approves the claim
SSA listing text and criteria
Abnormality of a major joint(s) in any extremity (see 101.00I ), documented by A, B, C, and D:
Subsection A
Chronic joint pain or stiffness. AND
Subsection B
Abnormal motion, instability, or immobility of the affected joint(s). AND
Subsection C
Anatomical abnormality of the affected joint(s) noted on: 1. Physical examination (for example, subluxation, contracture, or bony or fibrous ankylosis); or 2. Imaging (for example, joint space narrowing, bony destruction, or ankylosis or arthrodesis of the affected joint). AND
- Physical examination (for example, subluxation, contracture, or bony or fibrous ankylosis); or
- Imaging (for example, joint space narrowing, bony destruction, or ankylosis or arthrodesis of the affected joint). AND
Subsection D
Impairment-related physical limitation of musculoskeletal functioning that has lasted, or is expected to last, for a continuous period of at least 12 months, and medical documentation of at least one of the following: 1. A documented medical need (see 101.00C6a ) for a walker, bilateral canes, or bilateral crutches (see 101.00C6d ) or a wheeled and seated mobility device involving the use of both hands (see 101.00C6e(i) ); or 2. An inability to use one upper extremity to independently initiate, sustain, and complete age-appropriate activities involving fine and gross movements (see 101.00E4 ), and a documented medical need (see 101.00C6a ) for a one-handed, hand-held assistive device (see 101.00C6d ) that requires the use of the other upper extremity or a wheeled and seated mobility device involving the use of one hand (see 101.00C6e(ii) ); or 3. An inability to use both upper extremities to the extent that neither can be used to independently initiate, sustain, and complete age-appropriate activities involving fine and gross movements (see 101.00E4 ).
- A documented medical need (see 101.00C6a ) for a walker, bilateral canes, or bilateral crutches (see 101.00C6d ) or a wheeled and seated mobility device involving the use of both hands (see 101.00C6e(i) ); or
- An inability to use one upper extremity to independently initiate, sustain, and complete age-appropriate activities involving fine and gross movements (see 101.00E4 ), and a documented medical need (see 101.00C6a ) for a one-handed, hand-held assistive device (see 101.00C6d ) that requires the use of the other upper extremity or a wheeled and seated mobility device involving the use of one hand (see 101.00C6e(ii) ); or
- An inability to use both upper extremities to the extent that neither can be used to independently initiate, sustain, and complete age-appropriate activities involving fine and gross movements (see 101.00E4 ).
Source: SSA Blue Book listing 101.18. Last synced 2026-05-04.
Where claims under 101.18 usually fail
One failure mode is meeting only part of the A to C criteria, such as having pain plus imaging changes but not having documented abnormal motion, instability, or immobility of the joint. Another failure mode is using imaging or an exam finding without tying it to the required combination of chronic pain or stiffness and abnormal motion/instability/immobility. A third failure mode is missing subsection D, especially the required duration (at least 12 months) and one of the specific documented outcomes, like a documented medical need for a walker, bilateral canes, bilateral crutches, or a wheeled and seated mobility device. A fourth failure mode is documenting a need for an assistive device but without the specific type and the listing's required link to the child's physical limitation and hand-use limitations.
Medical evidence that strengthens this claim
Medical records should show subsection A (chronic joint pain or stiffness), usually through treatment notes that describe ongoing pain or stiffness. Records should also document subsection B (abnormal motion, instability, or immobility of the affected joint), typically from physical exam findings in an orthopedic or other medical visit. Subsection C should be supported by physical exam and/or imaging describing anatomical abnormality, such as subluxation, contracture, bony or fibrous ankylosis, joint space narrowing, bony destruction, or ankylosis/arthrodesis. For subsection D, documentation needs to support the 12-month duration (lasted or is expected to last at least 12 months) and include at least one of the listed functional/medical-need items, such as a documented medical need for a walker, bilateral canes, or bilateral crutches, or a wheeled and seated mobility device involving both hands, or (for upper extremity limits) an inability to use one or both upper extremities for age-appropriate fine and gross movements plus a documented need for a one-handed hand-held assistive item
What happens if your records do not meet this listing
If the required A, B, C, and D combination is not fully met, the claim can still be decided using a later step that looks at overall functional limits instead of matching every lettered requirement. That means the condition is evaluated for the child's residual functional ability, considering how the musculoskeletal impairment limits physical functioning and age-appropriate activities. If the medical evidence supports that the child's overall limitations are severe and long-lasting, the claim may still be approved without every exact listing detail.
Work activity and the SGA gate for this condition
For a child SSDI or SSI claim process, the work-activity gate is generally about whether work activity applies; for children, this gate is typically not the same way it is for adults, so the focus stays on documented functional limitations. Once approved, the extended eligibility rules apply after the medical requirements are met for eligibility based on the child's impairment. For 101.18 specifically, the core issue is whether the major joint abnormality has chronic joint pain or stiffness (subsection A), abnormal motion/instability/immobility (subsection B), and an anatomical abnormality on exam or imaging (subsection C), and whether the impairment-related physical limitation lasts at least 12 months (subsection D) with one of the listed assistive-device or upper extremity use limitations.
Listing 101.18 FAQ
Questions that come up repeatedly for abnormality of a major joint(s) in any extremity disability claims.