Hierarchical Condition Category (HCC) Coding Tips

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  • A diagnosis code may only be reported if it is explicitly spelled out in the medical record. Be sure diagnosis code(s) billed are consistent with medical record documentation. Report diagnosis codes as specifically and accurately as possible.
  • Lack of specificity is an issue, such as unspecified arrhythmia versus a specific type of arrhythmia.
  • Documentation must show that condition was monitored, evaluated, assessed, or treated (MEAT). Treatment is prima facia evidence of a diagnosis—if you’re treating, it therefore exists.
  • Cancer status is unclear and treatment is not documented.
  • Electronic health record must be authenticated and electronically signed with a legible signature with credentials.
  • Diagnosis and procedure codes billed should accurately reflect the level of service supported by the patient’s medical records.
  • A discrepancy exists between billed diagnosis and actual description of the condition noted in documentation.
  • Chronic diseases treated on an ongoing basis may be coded and reported as many times as the patient receives treatment and care for the condition(s).
  • Chronic conditions and status codes are not documented on an annual basis. Chronic conditions such as hepatitis are not documented as chronic.
  • Code all documented conditions, which coexist at the time of the visit that require or affect patient care or treatment.
  • Required linking language, causal relationship, or manifestation codes are missing.
Annual Wellness Visits
Atrial Fibrillation
Cancer
Chronic Kidney Disease

Document the Underlying Cause (if known):

Diabetes     E11.29
Glomerulonephritis     N05.9
Polycystic kidney disease     Q61.3
Hypertension     I12.9
Lupus     M32.10

Code Also (if present and documented):

Kidney transplant status     Z94.0
Chronic dialysis status     Z99.2
Tracheostomy status     Z93.0
Chronic respiratory failure     J96.10

Commonly Used Codes for Chronic Kidney Disease (if present and documented):

Hypertension and Chronic Kidney Disease     I12.9, N18.9
Diabetic Chronic Kidney Disease and Hypertension     E11.29, I12.9, N18.9
ESRD and Hypertension     I12.0, N18.6
ESRD, Hypertension, on Dialysis     I12.0, N18.6, Z99.2
Chronic Renal Insuffucuency     N18.9

Chronic Kidney Disease Stages based on GFR:

Stage   Severity   Description - GFR (ml/min/1.73m2)   ICD-10-CM
I     Normal or mildly elevated GFR     GFR ≥ 90 ml/min/1.73 m² with kidney damage     N18.1
II     Mild     GFR 60–89 ml/min/1.73 m² with kidney damage     N18.2
III     Moderate     GFR 30–59 ml/min/1.73 m²     N18.3
IV     Severe     GFR 15–29 ml/min/1.73 m²     N18.4
V     Kidney failure     GFR < 15 ml/min 1.73 m²     N18.5
ESRD     End stage renal disease     Requiring chronic dialysis/kidney transplant     N18.6
CKD unspecified     Unspecified     Chronic kidney disease, unspecified     N18.9
Stage V or ESRD     Requiring dialysis     Dependence on renal dialysis     Z99.2
Stage V or ESRD     Requiring dialysis     Patient’s noncompliance with renal dialysis     Z91.15

Coding Chronic Obstructive Pulmonary Disease (COPD)
Documentation and Coding Basics
Commonly Missed Chronic Conditions
Coding Congestive Heart Failure
Coding CerebroVascular Accident (CVA)

Common Code Combinations (when the conditions listed are documented and present):

Hemiparesis due to old stroke – I69.959, I69.951, I69.952, I69.953, I69.954
Aphasia due to old stroke – I69.920
Weakness due to old stroke – I69.898, I69.998, G93.3, R53.1, R53.81, R53.83
Old CVA with residual dysphagia – I69.991
Old stroke w/ no residuals – V12.54

Diabetes

The three diabetic HCCs are part of a hierarchy, where HCC 17 is ranked highest and HCC 19 is ranked lowest. For risk score calculation, only diagnoses within the highest ranked HCC within a hierarchy are captured for a patient encounter. Not all HCCs are part of a hierarchy, which makes documenting diabetic diagnoses to the greatest specificity so important.

HCC 17    Diabetes with Acute Complications    Diagnoses included in HCC 17 are diabetic ketoacidosis, hypoglycemia or hyperosmolarity, with or without coma. Patients with acute, life threatening complications such as these often use the greatest amount of health care resources.
HCC 18    Diabetes with Chronic Complications    Diagnoses included are diabetes without complications and the diagnosis long term use of insulin. Five of the six diagnoses have “without complications” in their narrative description. HCC 19 has the greatest opportunity for clinical documentation specialists in reviewing documentation, looking for clinical indicators, lab values and abnormalities in the physical exam to generate a compliant query for diabetes specificity.
HCC 19    Diabetes without Complication    Chronic diabetic complications of neuropathy, retinopathy and chronic kidney disease to list a few. Patients with diabetes are susceptible to chronic conditions that affect renal, nervous and cardiovascular systems. Many patients have several diabetic complications concurrently. Documenting and coding the progression of diabetes and the associated complications is so important in today’s quality and risk adjustment world.

What type is it?

Diabetes mellitus due to underlying condition    E08.-
Drug or induced diabetes mellitus    E09.-
Type I diabetes mellitus    E10.-
Type II diabetes mellitus    E11.-
Other specified diabetes mellitus    E13.-

Commonly Used Type 2 Diabetic Complication Code Combinations?

Diabetic with Kidney    E11.21 (nephropathy), E11.22 (CKD) with N18.1 (Stage 1);N18.2 (Stage 2);N18.3 (Stage 3);N18.4 (Stage 4);N18.5 (Stage 5);N18.6 (ESRD);Z99.2 (Renal Dialysis), E11.29 (Other Kidney Complication)
Diabetic with Ophthalmic (Retinopathy)    E11.31- (unspecified), E11.32- (mild non-proliferative), E11.33- (moderate non-proliferative), E11.34- (severe non-proliferative), E11.35- (proliferative)
Diabetic with Ophthalmic    E11.36 (cataract), E11.39 (other ophthalmic)
Diabetic with Neurological    E11.40 (neuropathy), E11.41 (mononeuropathy), E11.42 (polyneuropathy), E11.43 (autonomic polyneuropathy), E11.44 (amyotrophy), E11.49 (other neurological)
Diabetic with Peripheral Circulatory    E11.51 (angiopathy without gangrene), E11.52 (angiopathy with gangrene), E11.59 (other circulatory)
Diabetic with Other Specified    E11.610 (neuropathic arthropathy), E11.618 (other arthropathy), E11.620 (dermatitis)
Diabetic with Other Specified (Foot Ulcer)    E11.621 with L94.4-~L97.5-, E11.622 (other skin ulcer) with L94.1-~L97.9 or L98.41~L98.49, E11.628 (other skin)
Diabetic with Other Specified (Hypoglycemia)    E11.641 (with coma), E11.649 (without coma)
Diabetic with Other Specified (Hyperglycemia)    E11.65
Diabetic with Other Specified (Hyperlipidemia)    E11.69 with E78.5, E11.69 with N52.1 (erectile dysfunction)

Deep Vein Thrombosis (DVT)

Document the activity of Deep Vein Thrombosis (if known):

Acute DVT of lower extremities – I82.409, I82.419, I82.429, I82.439, I82.449, I82.499, I82.4Y9 (use caution when assigning these codes as this does not usually occur in the physician office setting)
Chronic DVT of lower extremities –I82.509, I82.519, I82.529, I82.539, I82.549, I82.5Y9, I82.5Z9
History of DVT - Z86.718 - (not under any current treatment such as Coumadin)

Coding Fractures
Depression Disorder in F32-F33

Classify depression by episode (single or recurrent), the severity (mild, moderate, severe with and without psychotic features) and the clinical status of the current episode:

Episode   Severity   Description   ICD-10-CM
Single     Mild     Major Depressive Disorder (mild)     F32.0
Recurrent     Mild     Major Depressive Disorder (mild)     F33.0
Single     Moderate     Major Depressive Disorder (moderate)     F32.1
Recurrent     Moderate     Major Depressive Disorder (moderate)     F33.1
Single     Severe without psychotic features     Major Depressive Disorder (severe)     F32.2
Recurrent     Severe without psychotic features     Major Depressive Disorder (severe)     F33.2
Single     Severe with psychotic features     Major Depressive Disorder (severe with psychotic features)     F32.3
Recurrent     Severe with psychotic features     Major Depressive Disorder (severe with psychotic features)     F33.3
Recurrent     In remission, unspecified     Major Depressive Disorder (in remission, unspecified)     F33.40
Single     In partial remission     Major Depressive Disorder (in partial remission)     F32.4
Recurrent     In partial remission     Major Depressive Disorder (in partial remission)     F33.41
Single     In full remission     Major Depressive Disorder (in full remission)     F32.5
Recurrent     In full remission     Major Depressive Disorder (in full remission)     F33.42
Recurrent     Unspecified     Major Depressive Disorder (unspecified)     F33.9

Commonly Used Codes:

Bipolar Disorder – F31.9
Schizophrenia – F25.9
Alcohol Dependence – F10.20
Drug Dependence – F11.20~F19.21

Malnutrition
Peripheral Vascular Disease (PVD)

Specify Manifestations (if present):

Ulcers (avoid the work "wound" to identify skin ulcers) - L97.-,
Gangrene - I96
Rest pain
Claudication
Cellulitis – L03.-
BKA status – Z89.519
AKA status – Z89.619
Foot amputation status – Z89.439

Common Code Combinations (when the conditions listed are documented and present):

Arteriosclerosis of the extremity - I70.209
Arteriosclerosis of the extremity with ulcers - I70.25
Arteriosclerosis of the extremity with rest pain - I70.229
Arteriosclerosis of the extremity with claudication - I70.219
Arteriosclerosis of the extremity with gangrene - I70.269
Diabetic peripheral vascular disease - E10.51, E10.65, E11.51, E11.65, I79.8
Diabetic foot ulcer – 250.8X, 707.1X
Foot amputation status – 250.8X, 707.1X

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