Multiple coding is acceptable when it takes more than one code to fully describe the condition. Which comes first, the disease, disorder, or the cause? When would it not be okay to code with more than one code?
In ICD-10-CM, coders must report two codes to fully describe certain conditions. They will find “Use additional code” notes in the Tabular List at codes when they need to report a secondary code to fully describe a condition. Report the “use additional code” as a secondary code.
ICD-10-CM also includes “code first” notes under certain codes that are not specifically manifestation codes but may be caused by an underlying cause. When coders see a “code first” note and the physician documents the presence of an underlying condition, report the underlying condition first.
The ICD-10-CM Official Guidelines for Coding and Reporting describe combination codes as those used to classify the following:
Coders cannot — and should not — assign multiple diagnosis codes when a single combination code clearly identifies all aspects of the patient’s diagnosis. For example, say a patient presents with obstructed and chronic cholecystitis with cholelithiasis and choledocholithiasis. Assign ICD-10 combination code K80.67 (calculus of gallbladder and bile duct with acute and chronic cholecystitis with obstruction). All components of the diagnostic statement are captured in this single code, and no additional codes are required.
Be on the lookout for instances in which the combination code lacks the necessary specificity to describe the manifestation or complication. In these instances, be prepared to assign an additional code. For example, say a physician provides a diagnostic statement of “undelivered mother in second trimester with Von Willebrand’s disease.” Assign ICD-10 code O99.112 (other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating pregnancy, second trimester) and ICD-10 code D68.0 (Von Willebrand’s disease).
The instructional notes throughout the tabular index remind coders when an additional code may be necessary. For example, the instructional note “use additional code to identify the specific condition” located under code category O99 reminds coders that they must assign a secondary code to identify any maternal diseases that complicate a pregnancy.
The alphabetic index also includes helpful hints. Look for subterms such as “with,” “due to,” “in,” or “associated with” to denote when a combination code may be applicable.
As mentioned above, combination codes are not a new concept, but they have been expanded in ICD-10. Consider these two important examples of new combination codes in ICD-10:
1. Diabetes mellitus. ICD-10 combination codes include both the diabetic manifestation as well as the diabetes itself. For example, say a physician provides a diagnostic statement of “type 1 diabetes complicated by gastroparesis.” In ICD-9, coders assign two codes — 250.61 (diabetes with neurological manifestations) and 536.3 (gastroparesis). In ICD-10, one single combination code, E10.43 (Type 1 diabetes mellitus with diabetic autonomic [poly]neuropathy), captures the entire encounter.
2. Conditions due to drugs, medicaments, and biological substances. ICD-10 combination codes denote whether the patient has experienced a poisoning, adverse effect, or underdosing as well as the specific substance responsible for the outcome. For example, say a patient presents with an accidental heroin overdose. In ICD-9, coders assign two codes — 965.01 (poisoning by heroin) and E850.0 (accidental poisoning by heroin). In ICD-10, one single combination code (T40.1X1A, poisoning by heroin, accidental [unintentional]) captures the entire encounter.
Consider these tips to ensure accurate application of combination codes:
Scan other
chapters of the ICD-10 book and circle combination codes that you
may report frequently and that previously required two separate
codes in ICD-9. Consider these examples:
ICD-10 code I25.110
(arteriosclerotic heart disease of native coronary artery with
unstable angina pectoris). In ICD-9, coders must report both 414.01
(coronary arteriosclerosis of native coronary artery) and 411.1
(intermediate coronary syndrome) to denote this condition.
ICD-10 code A69.23
(arthritis due to Lyme disease). In ICD-9, coders must report both
088.81 (Lyme disease) and 711.89 (arthropathy associated other
infectious and parasitic diseases) to denote this condition.
Don’t be afraid to query. When coders suspect
that a combination code may be applicable, but documentation
doesn’t clearly link the two diagnoses, query the physician for
more information. In some cases, the physician must state clearly
that a condition is “due to” another condition. For example, say a
patient is admitted with a gastrointestinal (GI) bleed. Upon
evaluation with EGD and colonoscopy, the patient is found to have
acute gastritis, duodenal angiodysplasia, and diverticulosis. The
physician doesn’t identify the source of the GI bleed. All three
conditions can cause bleeding, and all three conditions have a
combination code that includes bleeding. Coders must query the
physician to determine the etiology of the GI bleed, if known.
As we all continue to focus on coding productivity in ICD-10, it’s also imperative to ensure data quality and integrity. Don’t be tempted to rush through a record just for the sake of meeting productivity standards. Coders must take their time and identify instances in which combination codes are applicable. When coders incorrectly report two separate codes rather than a single combination code, not only does data quality suffer, but reimbursement also could be at risk.
Omitting a complication entirely also can have a negative effect on quality and reimbursement. Familiarize yourself now with the combination codes you anticipate reporting most frequently, and be on the lookout for others.
Multiple coding is acceptable when it takes more than one code to fully describe the condition....
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