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How to Document and Code for Hypertensive Diseases in ICD-10 THIS INSTALLMENT in FPM’S ICD-10 SERIES EXPLAINS the GUIDELINES for CODING HYPERTENSION

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How to Document and Code for Hypertensive Diseases in ICD-10 THIS INSTALLMENT in FPM’S ICD-10 SERIES EXPLAINS the GUIDELINES for CODING HYPERTENSION How to Document and Code for Hypertensive Diseases in ICD-10 THIS INSTALLMENT IN FPM’S ICD-10 SERIES EXPLAINS THE GUIDELINES FOR CODING HYPERTENSION. Kenneth D. Beckman, MD, MBA, CPE, CPC ecause ICD-10 can be a distressing topic, let’s start or kidney disease. That code is I10, Essential (primary) with some good news: Hypertension has a limited hypertension. number of ICD-10 codes – only nine codes for pri- As in ICD-9, this code includes “high blood pressure” mary hypertension and five codes for secondary but does not include elevated blood pressure without a B hypertension. This makes the task of coding hypertension diagnosis of hypertension (that would be ICD-10 code relatively simple – well, at least compared to some of the R03.0). If a patient has progressed from elevated blood other ICD-10 complexities. pressure to a formal diagnosis of hypertension, a good Another positive change in ICD-10 is that the new documentation practice would be to include the reason for code set drops the previous reference to benign and progressing the formal diagnosis. Similarly, a single mildly malignant hypertension. As physicians, we are well aware elevated blood pressure reading should be coded with the that hypertension is never truly “benign,” and the removal R03.0 until the formal diagnosis is established. of this antiquated term is a welcome improvement in the Although various sources define hypertension slightly lexicon of diseases. differently, the provider should document elevated systolic But, of course, nothing is easy in ICD-10, and there are pressure above 140 or diastolic pressure above 90 with at several things you need to be aware of before we dig into least two readings on separate office visits. There are slight the codes themselves. For example, the hypertensive disease variations of this for older individuals and for individuals codes in ICD-10 exclude several conditions: hypertension with readings obtained through ambulatory blood pressure complicating pregnancy, neonatal hypertension, primary monitoring. From a documentation viewpoint, it is only pulmonary hypertension, and primary and secondary important that the provider clearly document the basis for a hypertension involving vessels of the brain or the eye. newly established diagnosis. Postprocedural hypertension is also excluded from the Example: Your patient, a 55-year-old female, has had secondary hypertension codes. blood pressure readings between 130-135/80-85 for several In addition, you’ll need to be careful throughout the years. At her annual examination, you record her blood “Diseases of the Circulatory System” chapter of ICD-10 pressure as 144/92 and 142/90. You discuss with her the to differentiate the capital “I” from the number “1.” The importance of following up and schedule another appoint- hypertension codes span from I10 to I15 (there is no I14), ment for two weeks later. At that time, she again has several and each series has its own peculiarities, as this article will readings above 140/90, so you document the progression explain. from prehypertension (R03.0) to essential hypertension (I10). Essential (primary) hypertension: I10 Hypertension and hypertensive In ICD-9, essential hypertension was coded using 401.0 heart disease: I11 (malignant), 401.1 (benign), or 401.9 (unspecified). ICD-10 uses only a single code for individuals who meet When an individual has hypertension and heart disease, criteria for hypertension and do not have comorbid heart it is up to the provider to determine whether there is a About the Author Dr. Beckman, a family physician, is vice president/chief medical officer for a health insurance company in Milwaukee, Wis. Author disclosure: no relevant financial affiliations disclosed. Downloaded from the Family Practice Management website at www.aafp.org/fpm. Copyright © 2014 American Academy of Family Physicians. For the private, noncommercial use of one individual user of the website. All other rights reserved. Contact [email protected] for copyright questions and/or permission requests. When you code hypertension with heart failure (I11.0) using ICD-10, you are required to also code the type of heart failure. causal relationship stated or implied. This rela- an acute exacerbation of his heart failure, was tionship determination is spelled out in the “Offi- briefly hospitalized, and had an echocardiogram cial Guidelines for Coding and Reporting” (draft performed documenting combined systolic and 2014).1 diastolic failure. At discharge, you update his The combination of hypertension and hyper- diagnosis codes to I11.0 and I50.43. When you tensive heart disease is currently coded using the see him in the office two weeks post-discharge and ICD-9 402.xx series of codes. As noted earlier, he is asymptomatic, his diagnosis codes could be each category is currently divided into malignant, I11.0 and I50.42 reflecting the chronic nature of benign, and unspecified essential hypertension his condition. with or without heart failure. In ICD-10, this is narrowed to only two base codes: Hypertension and chronic • I11.0, Hypertensive heart disease with kidney disease: I12 heart failure, • I11.9, Hypertensive heart disease Unlike hypertension and heart disease, where the without heart failure. provider must determine whether a causal rela- ICD-10 includes The ICD-10 manual does not list the required tionship exists, if the patient has hypertension and nine codes for pri- documentation for hypertensive heart disease. It develops chronic kidney disease, ICD-10 presumes mary hypertension is recommended, however, that the provider doc- a cause and effect relationship and classifies the and five codes ument the basis for the diagnosis (exam, electro- condition as hypertensive chronic kidney disease. for secondary cardiogram, echocardiogram, etc.) at least the first Note, however, that if the chronic kidney disease hypertension. time this diagnosis is made for the patient. It is not came first, then the combination falls into the sec- uncommon for patients with long-standing hyper- ondary hypertension codes discussed later in this tension to develop some cardiac changes, but to article. code I11.9 instead of just I10, the provider needs Both ICD-9 and ICD-10 require specifying The code for to document the support for doing so. the stage of the chronic kidney disease to properly essential (primary) hypertension, I10, Unlike ICD-9, when you code hypertension code the condition. Very few patients have a true does not include with heart failure (I11.0) using ICD-10, you are glomerular filtration rate (GFR) measured and elevated blood required to also code the type of heart failure from most staging relies on the estimated glomerular pressure without the I50 series: filtration rate (eGFR). Most laboratory reports a diagnosis of • I50.1, Left ventricular failure, provide a race-based reference range. It is not hypertension. • I50.2, Systolic (congestive) heart failure, uncommon for these estimates to have slight • I50.3, Diastolic (congestive) heart failure, variability and for the patient’s staging to vary • I50.4, Combined systolic and diastolic heart between stage 2 and 3. Note that ICD-10 differ- failure, entiates stage 5 from end-stage renal disease by the There are just • I50.9, Heart failure, unspecified. need for chronic dialysis. two base codes If you do not have a measurement of the left ICD-10 requires first using an I12 code for the for patients with ventricular ejection fraction (typically from an combined diagnosis of hypertension and chronic hypertension and echocardiogram), then you would need to use the kidney disease: heart disease: I11.0 (with heart failure) more general left ventricular failure code (I50.1). • I12.0, Hypertensive chronic kidney disease and I11.9 (without The three codes for systolic, diastolic, and com- with stage 5 chronic kidney disease or end- heart failure). bined failure also require a fifth digit specifying stage renal disease, the acuity of the diagnosis: • I12.9, Hypertensive chronic kidney disease • 0, Unspecified, with stage 1 through 4 chronic kidney disease • 1, Acute, or unspecified chronic kidney disease. • 2, Chronic, These two codes require an additional N18 • 3, Acute on chronic. code to identify the stage of kidney disease, with Example: You have been following a 60-year- documentation typically referencing the most old male with hypertension and mild heart failure. recent eGFR: You have coded I11.0 and I50.9. He recently had • N18.1, Chronic kidney disease, stage 1, www.aafp.org/fpm | 2 • N18.2, Chronic kidney disease, stage 2 (mild), Example: The 55-year-old female in the above • N18.3, Chronic kidney disease, stage 3 example presents to your office with some pedal When using an I12 (moderate), edema, and on examination you also detect some code for patients • N18.4, Chronic kidney disease, stage 4 mild crackles in the base of her lungs. You order with hypertension (severe), an echocardiogram that documents mild systolic and chronic kidney • N18.5, Chronic kidney disease, stage 5, heart failure. Her eGFR has remained stable. You disease, add an • N18.6, End-stage renal disease, update her diagnostic codes to I13.0 (Hyperten- N18 code to iden- • N18.9, Chronic kidney disease, unspecified. sive heart and chronic kidney disease with heart tify the stage of Example: You have been treating a 55-year-old failure and with stage 1 through 4 chronic kidney kidney disease. black female for hypertension (I10) for the past disease, or unspecified chronic kidney disease), five years. On her most recent office visit, you I50.21 (Systolic, congestive, heart failure, acute), performed a comprehensive metabolic profile. All and N18.3 (Chronic kidney disease, stage 3, ICD-10 assumes a values were within the laboratory reference range moderate). causal relationship except her BUN and creatinine. The laboratory between hyperten- calculated her eGFR at 40 (mL/min/1.73m2). Tobacco use or exposure in individuals sion and chronic Repeat testing produces a similar result.
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