Basic ICD-10-CM and ICD-10-PCS Coding Exercises - Fifth Edition - Odd-Numbered Answer Key

Sep 30, 2026

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Odd-numbered answers and accompanying rationales for ICD-10-CM and ICD-10-PCS coding exercises, including chapter-based case selections. The answer key provides specific primary or first-listed diagnoses, secondary diagnoses, and coding rationale, such as combination-code selection, guideline-based exclusions, index-based term guidance, and additional coding instructions for infection organism classification. It also addresses procedure coding when procedures are not indicated, and includes an example coding table for a respiratory system excision scenario.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages113

Reading Time4 h 45 min

AccessFree to download

Chapter 1: Certain Infectious and Parasitic Diseases

Odd-numbered diagnoses and rationales (1-17)

Chapter 2: Neoplasms

Neoplasm case coding and rationale (1)

Example procedure and code component breakdown

Note to instructors: This answer key contains the odd-only answers and rationales that are printed in the back of the workbook. They have been updated to reflect 2017 codes and guidelines, and you may share this key with your students if you wish. Chapter 1 : Certain Infectious and Parasitic Diseases 1. First-Listed Diagnosis: A56.09 Cervicitis, chlamydial Secondary Diagnoses: None indicated by the documentation provided Rationale: ICD-10-CM has a combination code that includes the diagnosis of cervicitis and the causative infectious agent chlamydia. 3. First-Listed Diagnosis: B18.1 Hepatitis, viral, chronic, Type B Secondary Diagnoses: K74.60 Cirrhosis of liver; F11.21 Addiction, heroin, see Dependence, drug, opioid in remission Rationale: The suspected liver failure is not coded because conditions documented as suspected are not coded for outpatient encounters, guideline IV.H., Uncertain diagnosis 5. First-Listed Diagnosis: A46 Erysipelas Secondary Diagnoses: None indicated by the documentation provided Rationale: For the single diagnosis treated during this visit, see the Index entry term erysipelas, or the main term cellulitis, subterm erysipelatous—see Erysipelas. 7. First-Listed Diagnosis: A54.01 Urethritis, gonococcal or Cystitis, gonococcal Secondary Diagnoses: None indicated by the documentation provided Rationale: ICD-10-CM provides a combination code that includes both sites of the infection and the infectious organism. 9. First-Listed Diagnosis: G14 Syndrome, postpolio Secondary Diagnoses: None indicated by the documentation provided Rationale: Another code B91, sequela of poliomyelitis, is not used as a specific diagnosis is provided, postpolio syndrome. There is an Excludes1 note present at B91 and G14 to indicate these two codes may not be assigned together. Postpolio syndrome is a specific condition and it is more descriptive of the patient than having a sequela of poliomyelitis and for that reason coded to G14 instead of B91 . The atrophy of the muscles is not coded separately as it is a symptom of the postpolio syndrome. 11. Principal Diagnosis: A41.59 Sepsis, gram negative (organism) Secondary Diagnoses: N39.0 Infection, urinary tract; B96.1 Infection, bacterial, as cause of disease classified, Klebsiella; E87.1 Hyponatremia; E87.6 Hypokalemia; C77.3 Neoplasm, malignant, secondary, axilla and upper limb lymph nodes; Z85.3 History, personal malignant neoplasm, breast (If information about the surgery (mastectomy, right or left) and acquired absence of breast is available, two additional codes could be added.) Principal Procedure: None Indicated by the documentation provided Secondary Procedure(s): None indicated by the documentation provided Rationale: In this scenario the diagnosis of severe sepsis was not made. For that reason no additional codes were added. In the Index under the main term of Sepsis, there is no subterm for Klebsiella but Klebsiella is a gram negative organism so A41.59 was chosen instead of A41.50, which represents gram negative sepsis, unspecified. In ICD-10-CM septicemia is referred to as sepsis as the main term. With the urinary tract infectious organism of Klebsiella identified, the coder must follow the instructional note under N39.0 to use an additional code to identify the Infectious organism. The coder must use the main term Infection, bacterial, as cause of disease classified, Klebsiella to locate the additional code of B96 . 1. Otherwise, if the coder used Infection, Klebsiella without following the “as cause of disease classified elsewhere,” an incorrect code would be assigned for another bloodstream infection, not the cause of the urinary infection. 13. First-Listed Diagnosis: B60.13 Keratoconjunctivitis, Acanthamoeba Secondary Diagnoses: None indicated by the documentation provided Rationale: There was a single reason for the office visit that was found to be the keratoconjunctivitis that was coded as the first-lis

FAQs

What type of content does this answer key provide for the workbook exercises?

It provides odd-only answers plus rationales for the ICD-10-CM and ICD-10-PCS coding exercises, organized by chapter and case number.

How does the key explain choosing combination codes in ICD-10-CM?

It states that when a diagnosis inherently includes another condition or infectious agent, the ICD-10-CM combination code should be used so separate codes for the included elements are not necessary.

What guidance is shown for coding infectious organisms with additional codes?

When the urinary tract infection organism (e.g., Klebsiella) is identified, the key explains that coders must use the additional-code instruction to select the correct “as cause of disease classified” code rather than an incomplete organism code.

Sep 30, 2026

Uploaded by Cipher