1. ICD-9- CM codes

2. The International Classification of diseases ICD, 9th revision, clinical modification (ICD-9- CM) is a modification of ICD-9 which are created by the world health organization (WHO).
Since 1979, ICD-9- CM has provided a diagnostic coding system for the compilation and reporting of morbidity and mortality statistics for reimbursement purposes in United States.
It allows for reporting of conditions, injuries, and traumas along with complications and circumstances occurring with the illness or injury. It also provides the reason for patient care

3. The ICD-9- CM contains three volumes
The ICD-9- CM contains three volumes. All health care facilities utilize volume 1
|( Tabular list of disease ) and vol.2 ( Alphabetic Index of Diseases) report diagnoses. Hospitals use Vol 3 to report inpatient procedures ( CTP is used to report procedures performed in physician offices, ambulatory care centers and hospital outpatient departments).
ICD-9-CM requires assignment of the most specific code to represent the problem being treated by provider. This means the primary diagnosis should be the one for the condition indicated within the medical record as the primary reason the patient sought medical care in an outpatient or office setting, or the principal diagnosis in an inpatient setting.

4. History and usage of ICD-9-CM
ICD-9-CM stands for International Classification of Disease, Ninth revision, Clinical Modification. It is used for coding and classify diagnoses and procedures by a numerical system. Classifying diseases by their cause has been done in various forms for many years, even as far back as the Greek civilization. The ICD-9-CM code book is updated every year with changes effective October 1 of that year. It is essential that code books and coding software be updated yearly with the revisions.

5. Tabular list (volume1)
volume1, the " Classification of Diseases and Injuries " is the tabular listing of diagnoses. 1) Once a coder has identified a code in the alphabetic index. 2) It must be vertified in the tabular list, codes are arranged numerically in 17 chapters and are grouped according to their cause (etiology ), such as fractures, or body system, such as digestive system.

6. Supplementary Classifications
There are two Supplementary Classifications included in the tabular list (volume1) these are:
1. V codes ( V01-V83)
V codes can be used to describe the main reason for the pateint's visit in cases where the patient is not " Sick" or used as a secondary diagnosis to provide further information about the patient 's medical condition. One example would be a patient who is not sick and comes in to receive a TB skin test. There is a V code,V74.1,
Screening for pulmonary tuberculosis that is used if a diagnosis is not identified for the patient.

7. 2. E Codes (E800-E999)
E codes are external causes of injury and poisoning. E codes are used as secondary diagnosis to show the cause of injury, such as fall or automobile accident, if it is known.
An example of injury E code is E828.2, accident involving animal being ridden, rider of animal.

8. The Alphabetical index (Volume2)
The Alphabetical index (Volume2) of ICD-9-CM consists of an alphabetic list of terms and cods, two supplementary sections following the alphabetic listing.

9. Procedures :tabular list and alphabetic index (Volume3)
Volume3 consists of two sections, tabular list and alphabetic index. These codes define procedures instead of diagnosis.
Operations on the nervous system01-05
Operations on the endocrine system06-07
Operations on the eyes08-16
Operations on the ear18-20
Operations on nose, mouth and pharynx 21-29
Operations on the respiratory system30-34
Operations on the cardiovascular system35-39

10. Example of Vol 3(ICD9-CM)
Operations on the cardiovascular system35-39
Operations on valves and septa 35
Open heart valvulopasty 35.1
Open heart valvulopasty of mitral valve without replacement 35,12

11. Operations on the lymphatic system40-41
Operations on the digestive system42-54
Operations on the urinary system55-59
Operations on the male genital system60-64
0perations on the female genital system65-71
Obstetric procedures72-75
Operations on the integumentary system76-84
Miscellaneous diagnostic and therapeutic procedure 87-99