The "cooperating party" responsible for maintaining the ICD-9-CM disease classification is the

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The National Center for Health Statistics (NCHS) is responsible for maintaining the ICD-9-CM disease classification. The Centers for Medicare and Medicaid Services (CMS) is responsible for implementing the use of ICD-9-CM codes for billing purposes, but they do not maintain the classification itself. The American Hospital Association (AHA) and the American Health Information Management Association (AHIMA) are professional organizations that may provide input and guidance on the use and implementation of ICD-9-CM, but they are not the primary parties responsible for maintaining the classification.

The "Cooperating Party" Responsible for Maintaining the ICD-9-CM Disease Classification