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Table 2 Codes of the ICD9MC used for selecting cases.

From: Is there much variation in variation? Revisiting statistics of small area variation in health services research

Procedure

ICD9CM codes

Observations

Appendectomy

47.0x; 47.1x

All appendectomies, including laparoscopic and incidentals.

Inguinal hernia repair

53.0x; 53.1x; 53.2x; 53.3x

Uni or bilateral repair, with or without mesh, of femoral or inguinal hernias.

Lower extremity amputation

84.10 to 84.17

Lower extremity amputation at any level.

Hip fracture

820.xx

Only emergency admissions.

Knee replacement

81.54; 81.55

Total or partial knee replacement

Pacemaker implant

37.80; 37.81; 37.82; 37.83

Pacemaker implant, permanent or not, in programmed or emergency admissions.

  1. ICD9CM: International Classification of Diseases 9 revision Clinical Modification; The "x" indicates all the range of digits after the corresponding code.