Notice that the subcategory is still not a complete code because it is not in bold and it has a hyphen, which tips off the reader that he or she needs to keep adding characters. This one is ‘acute serous otitis media,’ which is a condition where fluid is trapped in the middle ear and can become infected. Once you add a fourth or fifth character you have entered a subcategory.Some complete codes on this page have five and six characters. All of the complete codes on this page lack a hyphen and are in bold. Also notice that H65.- is followed by a hyphen, which indicates that this is not a complete code. Notice that the formatting here makes it easy to spot when you are at the beginning of a new category because of the line above the three-character heading. This one, H65.-, is for “nonsuppurative otitis media”. Blocks are divided into three-digit categories.The formatting here makes it easy to see when a new block begins. If there were guidelines that pertained to the whole block, they would appear under this heading. This one is Diseases of Middle Ear and Mastoid (H65-H75). A chapter is divided into blocks, or a range of three-digit categories.These guidelines apply to every code in this chapter, so it is important to come back to them from time to time to make sure your code is the right one. Notice all of the rules listed under the chapter heading. Every code in this chapter begins with the letter “H”. This is the beginning of chapter 8, which covers Diseases of the Ear and Mastoid Process. Let’s see how this looks in a coding manual.
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