FSN

A Clinical finding/Disorder concept's fully specified name (FSN) must be specific, though the preferred term (PT) can be a more clinician-friendly, word-order variant.

FSN Pattern

The FSN must conform to a specific pattern of "Disease of x" where a specific body structure is involved. For the preferred term, end users can choose the desired description that conforms to common clinical usage.

For example,

• FSN: Disease of kidney (disorder)

• PT: Can be either 'Kidney disease' or 'Renal disease'

Use of -opathy

The use of -opathy is to be used in the preferred term, because the FSN is to be specific and explicit, and there are often various interpretations of -opathy. A term containing the suffix -opathy can only be used in the FSN if a definition is applied via the DEF description.

For example,

• FSN: Disorder of macula of retina (disorder)

• PT: Can be either 'Disorder of macula of retina' or 'Maculopathy'

The morphologic abnormality is named before naming the anatomical site.

For example,

• In 399525009 | Inflammation of ampulla of Vater (disorder)|, Inflammation is the morphologic abnormality and Ampulla of Vater is the finding site.

Descriptions for Clinical findings and Disorders should follow the naming guidelines for Body structures if they are to be used within the Clinical finding/disorder concept.

Concepts describing limbs are abundant, and the use of limb in the FSN and the synonyms of upper/lower extremity, arm/leg should be followed.

• For example,

  • 249945007 |Monoparesis of lower limb (disorder)|

Because the finding site is 61685007 |Lower limb structure (body structure)|, which follows the anatomical guidelines, the disorder concept reflects lower limb in the FSN, while using synonyms of Monoparesis of leg and Monoparesis of lower extremity.

The term cerebral is used in clinical language to mean both cerebrum , and more broadly, brain.

• If the condition is limited to the cerebrum, the FSN, PT, and finding site will reflect the cerebrum. A synonym will remain with the term cerebral.

• If the condition refers more broadly to the brain, the FSN, PT, and finding site will reflect the brain – unless the proper name of the condition uses the term cerebral , as in Cerebral palsy. A synonym will remain with the term cerebral if it is commonly used to refer to the condition.

The word disorder should be singular, so Disorder of nose , not Disorders of nose.

• When the concept is a general grouping of disorders of a body system, body site, or other broad category, the word disorder is preferred over the word disease for the FSN, e.g. Disorder of reproductive system , not Disease of reproductive system. This does not apply at the leaf level.

• For example,

  • 417683006 | Sickle cell-hemoglobin C disease without crisis (disorder)|

For naming conventions concerning surgical complications, sequelae, and late effects; see this section at .

The vast majority of existing X without Y concepts originated from ICD-9 with the specific meaning of "X disorder without mention of Y disorder". As the phraseology indicates a lack of data about disorder Y as opposed to a specific exclusion, this type of concept has not been included in ICD-10, nor proposed for ICD-11, except in the case of "Traumatic brain injury without open intracranial wound".

Addition of new X without Y concepts may only be made under the following conditions:

• The request for new content must be accompanied by a rationale as to the difference between "X disorder without Y disorder" and "X disorder"

• Approval of addition by the Chief Terminologist

For the most part, existing X without Y concepts will be inactivated as AMBIGUOUS with a historical MAY BE relationship to "X disorder". Exceptions to inactivation will be made on a case-by-case basis.

SNOMED international is no longer accepting new requests for concepts of the type – Requires [procedure/drug] (finding). These are administrative statuses rather than clinical findings, and this status should be represented outside of the terminology in the information model. The only exceptions relate to legacy content, and requests for subtypes of 723620004 |Requires vaccination (finding)| will continue to be accepted.

If the 363698007 | Finding site (attribute)| value of a concept is a body structure with "region" in its FSN, then the description of the finding site within the clinical finding concept's FSN should also include "region".

• For example,

  274205003 | Burn of eye region (disorder)| has a finding site of 371398005 | Eye region structure (body structure)|.

  • FSN: Burn of eye region (disorder)

  • PT: Burn of eye region

Previously, allergies caused by multiple substances were modeled by multiple causative agents suggesting that the allergy is caused by all those substances. However, when multiple substances are noted in the FSN, the intended clinical meaning is that a patient might be affected by one or more of these substances (or products containing them). To convey this meaning, these types of concepts should be modeled GCIs to represent the disjunctive meaning. e.g. 870731003 |Allergy to carbidopa and/or levodopa (finding)|

Allergic and nonallergic hypersensitivity (pseudoallergic) dispositions are the propensity to develop adverse allergic or nonallergic hypersensitivity (pseudoallergic) disorders. A description for any concept that names a substance or an organism should be consistent with the corresponding hierarchy description rules.

• FSN: Allergy to X (finding)

• PT: Allergy to X

For example,

• FSN: Allergy to abacavir (finding)

• PT: Allergy to abacavir

• FSN: Allergy to Artemisia vulgaris pollen (finding)

• PT: Allergy to mugwort pollen

FSN: Allergy to X and Y (finding)

PT: Allergy to X and Y

• X and Y in alphabetical order for concepts representing multiple substances

These disorders represent manifestations of pathologic processes that may result in abnormal structures (e.g., allergic rhinitis).

These disorders represent pathological processes that are defined as adverse reactions and allergic conditions with a pathological process of allergic or nonallergic hypersensitivity (pseudoallergic) process.

Contact hypersensitivity represents a response elicited by contact of the skin or mucous membranes with a substance. The response may be immune mediated (allergic) or nonimmune (irritant) using the pathological process contact hypersensitivity process (qualifier value).

• For example,

  • Contact dermatitis (disorder)

  • Irritant contact dermatitis (disorder)

An intolerance is the propensity to develop an adverse reaction to a substance. The nature of the adverse reaction can represent a variety of pathological processes but specifically excludes hypersensitivity (allergic and nonallergic hypersensitivity (pseudoallergic) reactions.

Due to the difficulty in precisely defining an intolerance pathological process, it is problematic to apply the model for hypersensitivity dispositions to defining intolerance to substance. For this reason, as well as the difficulty in associating a material agent with a disposition, substances are related to the intolerance disposition with the associated with attribute.

Identification of findings of inadequate or excessive intake of nutrients inconsistent with nutrient requirements and established reference standards includes nutrients with a variety of forms where applicable.

For example,

870465001 | Excessive intake of vitamin A and vitamin A derivative (finding)|

FSN: Excessive intake of vitamin A and vitamin A derivative (finding)

PT: Excessive intake of vitamin A and vitamin A derivative

Right, left disorder concepts

When creating a lateralized disorder concept, two concepts should be created:

1. concept for the left side

2. concept for the right side

Descriptions

• FSN: <morphologic abnormality> of <right/left> <body structure> (disorder)

• PT: Right/left

  • For example, 1089071000119109 |Inflammation of left mastoid (disorder)|

    • FSN: Inflammation of left mastoid (disorder)

    • PT: Left mastoiditis

When creating a lateralized disorder concept, if a non-lateralized parent does not exist, then it should be created as well. In other words, do not just create the right and left versions, but also create a concept to represent the laterality-agnostic parent.

• For example,

  • When creating Inflammation of left mastoid and Inflammation of right mastoid, also ensure a concept for Inflammation of mastoid exists.

Where the disorder is left/right of a specific anatomical site, and the preferred term naming pattern of Right/left causes a combination that does not sound like natural flowing English, the guidance above can be circumvented. See the section and Laterality section .

• For example,

  • Left interphalangeal thumb joint open traumatic dislocation should follow naming guidance of Open traumatic dislocation of interphalangeal joint of left thumb.

  • Left abscess of foot is an incorrect term; instead, this should read Abscess of left foot.

Where the bilateral disorder description causes a combination that does not sound like natural flowing English, the guidance below can be circumvented.

• FSN: of bilateral (disorder)

• PT: Bilateral

• SYN: of bilateral

• SYN: of both

• FSN: of bilateral (disorder)

• PT: of bilateral

• SYN: of both

Note the PT of Bilateral is not required. Bilateral is to describe the body site, not the morphologic abnormality.

• For example, 15725081000119100 | Effusion of joint of bilateral feet (disorder) |

  • FSN: Effusion of joint of bilateral feet (disorder)

  • PT: Effusion of joint of bilateral feet

  • SYN: Effusion of joint of both feet

Also note that joint is singular. This is to denote that the joint may be singular on each side of the body; the plurality of feet will represent the laterality. Using joints as plural may incorrectly reflect that there are multiple joints affected in both feet.

Bilateral disorders should be modeled using two relationship groups, one for each lateralized body structure.