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PRACTICE RESOURCES > Coding and Reimbursement > Coding Tips > Coding Basics > ICD Diagnosis Coding

ICD Diagnosis Coding

ICD-10-CM Coding System

International Classification of Diseases, 10th Revision, Clinical Modification (ICD10-CM) codes indicate the condition, symptoms, problems, complaints, diagnosis or other reasons for the visit or procedure. In other words, ICD-10 codes justify the use of CPT® codes. You may list up to eight ICD-10 codes on the Medicare claim form, but the first one used must reflect the chief reason for the services provided. Enter only one diagnosis per detail line on the electronic or paper claim. The additional diagnoses are used to describe any co-existing conditions. The chief reason and the co-existing conditions must also be noted in the medical record. Co-existing conditions requiring specific tests or procedures should also be recorded on the claim form and in the medical record.

Billing the Highest Level of Specificity

ICD-10 codes are composed of three-, to seven-digit alphanumeric codes. ICD-10 codes classify groups of diseases and injuries by etiology and by organ system. These codes also classify symptoms.

Diagnosis codes must always be documented to the highest known level of specificity. If a three-digit code lists additional-digit codes as subcodes, then the three-digit code becomes a category, not a billable code.

Samples of ICD-10 Levels

N32 Other disorders of bladder
N32.0 Bladder neck obstruction
N32.1 Intestinovesical fistula
N32.2 Vesical fistula, not elsewhere classified
N32.3 Diverticulum of bladder
N31.2 Flaccid neuropathic bladder, not elsewhere classified
N32.81 Overactive bladder
N31.8 Other neuromuscular dysfunction
N31.0 Uninhibited neuropathic bladder, note elsewhere classified
N31.1 Reflex neuropathic bladder, note elsewhere classified
N31.9 Neurocmuscular dysfunction of bladder, unspecified
N36.44 Muscular disorders of urethra
N32.89 Other specified disorders of bladder
N32.89 Other specified disorders of bladder
N32.89 Other specified disorders of bladder
N32.9 Bladder disorder, unspecified


Using ICD-9 Z Codes
This can arise in two main ways:

ICD-10 Z Codes

Z85.46 Personal history of malignant neoplasm of prostate
Z85.47 Personal history of malignant neoplasm of testis
Z85.51 Personal history of malignant neoplasm of testis
Z43.6 Encounter for attention to other artificial openings of urinary tract

How to Identify the Correct ICD-10-CM Diagnosis Code

Refer to the most current ICD-10-CM Codebook:

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