ICD-10 code for prosthesis external fitting

The ICD-10-CM code for prosthesis external fitting is Z44.9 (Encounter for fitting and adjustment of unspecified external prosthetic device). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Z44.9.

Within Z44, choose Z44.9 (unspecified external prosthetic device) only when documentation doesn't support a more specific option: artificial arm (Z44.0), artificial leg (Z44.1), artificial eye (Z44.2), external breast prosthesis (Z44.3) and other external prosthetic devices (Z44.8).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 945 (Rehabilitation with CC/MCC, relative weight 1.4749) and DRG 946 (Rehabilitation without CC/MCC, relative weight 1.1051), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.