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In medicine, not otherwise specified (NOS) is a subcategory in systems of disease/disorder classification such as ICD-9, ICD-10, or DSM-IV.It is generally used to note the presence of an illness where the symptoms presented were sufficient to make a general diagnosis, but where a specific diagnosis was not made.
ICD-10 is the 10th revision of the International Classification of Diseases (ICD), a medical classification list by the World Health Organization (WHO). It contains codes for diseases, signs and symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or diseases. [1]
The ICD-10 equivalents also became part of its definition of autism spectrum disorder, as of the ICD-11. PDD-NOS included atypical autism, a diagnosis defined in the ICD-10 for the case that the criteria for autistic disorder were not met because of late age of onset, or atypical symptomatology, or both of these. [5]
This is a shortened version of the sixth chapter of the ICD-9: Diseases of the Nervous System and Sense Organs. It covers ICD codes 320 to 389. The full chapter can be found on pages 215 to 258 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
The DSM-5 (2013), the current version, also features ICD-9-CM codes, listing them alongside the codes of Chapter V of the ICD-10-CM. On 1 October 2015, the United States health care system officially switched from the ICD-9-CM to the ICD-10-CM. [1] [2] The DSM is the authoritative reference work in diagnosing mental disorders in the world.
It includes references to existing international standards such as ICD-10, ICD-11, ICF as well as SNOMED CT clinical terminology. It provides a framework for documenting and organizing clinical data from primary care patient contacts. The ICPC-3 includes codes for the four key elements of healthcare encounters: the reason for the encounter (RFE);
F78.A1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2023 edition of ICD-10-CM F78.A1 became effective on October 1, 2022. This is the American ICD-10-CM version of F78.A1 - other international versions of ICD-10 F78.A1 may differ.
A 2004 meta-analysis estimated the prevalence of PD-NOS in patient samples between 8-13%. In structured interview studies it is the third most common diagnosis given, in unstructured studies it is the single most frequent diagnosis. Half the studies did not give further definition for the diagnosis, and those that did used "mixed" most often. [7]