ICD 10 and NephrologyHow to find ARF and CKD

For Coders and Clinical Documentation Specialists

Jeff Kaufhold MD FACPNephrology Associates of Dayton

Oct 2013

Summary

• Review of the development of ICD 10• Changes coming with ICD 10• Top 5 Clinical Documentation Issues• Making the Diagnosis of ARF and CKD• ICD 10 codes for renal disease• RIFLE criteria for Acute renal Failure• Progression of CKD and CKD stages• How to differentiate Acute from Chronic

ICD 9 and 10 history

• ICD 9 developed by WHO• ICD 9 Clinical Modification developed for US in 1979.• CPT (clinical Procedural Terminology) codes used for

ambulatory reporting.• ICD 10 developed in 1990’s• ICD 10 codes are now available in EPIC as of Oct 1 2013• Mandatory use of ICD 10 is Oct 1, 2014.• CPT codes will continue to be used for physician

practice settings/ office billing

ICD 10 after Oct 1 2014

• Required for HIPAA transactions• ICD 10 CM (Diagnosis) codes Required for

diagnosis of all services inpt or outpt• ICD 10 PCS (procedure) codes will be required

on inpt claims• EPIC is starting the migration from ICD 9 to 10

codes now, and EPIC Premier inpt billing function includes the new ICD 10 coding structure.

ICD 10 Changes

Over 50% of new Dx are musculoskel, and 36 % are to distinguish R from L

ICD 10 Changes

• Up to 7 characters• Includes complication, severity, sequelae and

other disease related parameters• Includes laterality• Includes initial or subsequent encounter code• Improved consistency of terminology• Combination codes are common i.e DM 2,

controlled with renal manifestation• Has space holders for expansion

ICD 10 PCS coding for inpts0 D B 5 8 Z X

Section Body system

Root operation

Body part Approach Device qualifier

Med/Surg GI Excision Esophagus Natural opening, endoscopic

No device implanted

Diagnostic

ICD 9 ; 45.16 EGD with excisional biopsy, ICD 10 0DB58ZX Endoscopic esophageal excision via natural or artificial opening

Most common issues in ICD 10

• Laterality – as you code, EPIC will prompt you if right or left is required

• Trimester specific• Many new orthopedic codes• Specificity is increased dramatically, so

physician documentation must be more specific too.

Top 5 Clinical Documentation Issues

• CHF• Sepsis• Renal Failure• Pneumonia• Respiratory Failure

• Don’t use “Other” or accept a nonspecific diagnosis like DM, when a more specific term exists:

• “DM 2 controlled with renal manifestation”

ICD 10 codes

• Epic is migrating codes so over next year you may search using known ICD 9 codes

• Can keep your PMHx and ongoing problem list NONSPECIFIC,

• But your visit diagnosis list must be as specific, detailed, and include as many modifiers/ comorbidities/severity codes as possible

Common Diagnoses

• ICD 9

• 250.02 DM 2 no mention of controlled or complication

• 250.43 DM 1 with renal manifestation

• ICD 10

• E11.65 DM 2 with hyperglycemia

• E10.21 DM 1 with nephropathy AND

• E10.65 DM1 with hyperglycemia

Top 5 Clinical Documentation issues

Condition Common issues Financial impact

CHF Acute vs Chronic, systolic vs diastolic

DRG 684 Renal failure without major complication or comorbidity

Sepsis Sepsis, severe sepsis, SIRS, bacteremia

$ 3609

Renal Failure Acute vs chronicStage with RIFLE criteria or CKD stageWith ATN is important

DRG 682 renal failure with major complication and comorbidity

Pneumonia Cause / specific bacteria Aspiration, simple vs complex, laterality

$ 9340

Respiratory Failure Acute vs chronic, resp distress vs resp failure

Quality Performance hinges on Documentation

• For inpts affects the hospital quality score• For our pts affects our practice score• Lack of clear documentation results in

inappropriate assignment of complication codes for expected consequence of renal disease

• Improved documentation results in lower reported complication rates,

• higher complexity/ comorbidity scores reflect sicker population we care for.

Estimated impact on physician practice

• 10 -20 % increase in denials• Differences in authorization and referral

triggers• Increased scrutiny of documentation• Impact on contracting/ preferred provider

status based on severity of illness as reflected in coding.

ICD 10 and EPIC

• ICD 10 diagnosis calculator goes live on Premier Epic Oct 28 2013

• Training modules available on Healthstream• Some codes require specific information, and

a coding window will open to fill in R vs L, initial visit vs followup, sequelae.

• Many codes won’t require more specificity, but for visits we should try to be as specific as possible.

ICD 10 and EPIC

• Many codes won’t require more specificity, but for visits we should try to be as specific as possible.

• We can double click item on the problem list like DM, HTN, Other disorder of renal etc, and make it more specific, without losing / deleting associations.

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Make the Diagnosis of Kidney Disease

• CriteriaThe ICD9 Code for CKD is 585.x where x = stage The ICD 9 Code for ARF is 584.9

Decreased kidney functioneGFR of <60 ml/min/1.73 m2 for ≥ 3 months

Abnormal urinalysis including the presence of proteinuria or hematuria

Request a spot urine protein/creatinine ratio(Normal is <30 mg/g)

Document an abnormal Renal Imaging Study

Specific details for pts with ARF and CKD

• DM Type I or II, controlled or uncontrolled– Use A1c over 6.5 as uncontrolled– With renal manifestation

• Hypertension – With nephropathy

• CKD stages 1-5, use ESRD for pts on dialysis in the medicare ESRD program.

• AKI with ATN

Specific details for pts with ARF and CKD

• AKI with ATN– Urine findings ATN casts– Oliguria– Creatinine over 2.5 or > 2X baseline– Were they pre-renal?

• Does pt have TIN?• Look for eosinophils in blood or urine

• Complications of renal failure– Anemia of CKD– Secondary hyperparathyroidism of renal origin– Protein calorie malnutrition Severe = albumin less than 3.0

Diabetes codes

• E08.22 DM due to underlying condition with diabetic nephropathy

• E09.22 Drug or chemical induced DM with DM CKD

• E10.22 DM I with Diab. Neph• E11.22 DM II with Diabetic Nephropathy• E13.22 Other specified DM with Diabetic CKD

CKD Codes

• N18.1 CKD stage 1• N18.2 CKD Stage 2• N18.3 CKD Stage 3• N18.4 CKD Stage 4• N18.5 CKD stage 5• N18.6 ESRD• N18.9 CKD unspecified

CKD and DM codes

• Code the DM first, then the stage:– E10.22 Type I DM with nephropathy– N18.6 ESRD

• Same for Hypertensive Kidney Disease– I12 hypertensive Kidney disease– N18.4 CKD Stage 4– If pt has heart and kidney disease, use

• I13 hypertensive Heart and CKD– CHF uses I 50 codes

HTN and CKD Codes

• I12.0 Hypertensive CKD with Stage 5 or ESRD• I12.9 “” “” with stages 1-4 CKD• I13.10 Hypertensive Heart and CKD without

heart failure, Stages 1-4• I13.11 Hypertensive Heart and CKD without

heart failure, Stage 5 or ESRD• I13.2 Hypertensive Heart and CKD with heart

failure, Stage 5 or ESRD

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The Early NHANES III StudyAnalysis of Prevalence of CKD by Stage

StageStage DescriptionDescription eGFR RangeeGFR Range(ml/min/ 1.73 m(ml/min/ 1.73 m22))

Population Population (1,000(1,000’’s)s)

Population Population (%)(%)

11 Kidney damage with

normal or increase GFR

≥ 90 5,900 3.3 %

22 Mildly decreased

GFR

60-89 5,300 3.0 %

33 Moderately decreased

GFR

30-59 7,600 4.3 %

44 Severely decreased

GFR

15-29 400 0.2 %

55 Kidney Failure < 15 300 0.1%

- Adapted from NHANES III (2000)

US Population with CKD

Coresh, Selvin, Stevens. Prevalence of CKD in the US. JAMA.2007;298(17)2038.

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A Large National Burden in 2009The Renal Continuum of Care

NephrologistNephrologistNephrologistNephrologist

Primary Care Primary Care PhysicianPhysician

Primary Care Primary Care PhysicianPhysician

ESRDESRDCKDCKDAt RiskAt Risk

PopulationPopulationAt RiskAt Risk

PopulationPopulation

DiabetesDiabetesHypertensionHypertension

ObesityObesity

CVDCVD

26,000,000+ People26,000,000+ People

500,000+ People500,000+ People~375,000 Dialysis~375,000 Dialysis

~125,000 Transplant~125,000 Transplant

Cardiovascular events by Stage of CKD

NKF KDOQI guidelines www.kidney.org/professionals/KDOQI/guidelines_ckd/toc.htm

All Cause Mortality By Stage of CKD

NKF KDOQI guidelines www.kidney.org/professionals/KDOQI/guidelines_ckd/toc.htm

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Why Do CKD Patients Need Special Care?

Renal Disease Care is Expensive

Other Medicare

ESRD + Late Stage Chronic Kidney Disease (CKD)

~ $30B peryear

~1.5% of Patients ~10% of Federal Healthcare Costs

Other Medicare

Source: USRDS (publicly available comprehensive clinical and financial dataset reported to and used by CMS)~375,000 ESRD + ~300,000 Stage 4 Chronic Kidney Disease

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Timely Referral: Long-lasting benefits

Late Referral patients have a 44% higher risk of mortality in the first year of dialysis compared to Early Referral patients

31

Who Should be Screened for CKD?

The AT RISK Population:

– HYPERTENSION

– DIABETES MELLITUS

– CARDIOVASCULAR DISEASE

– FAMILY HISTORY OF CKD

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Screening Recommendations

• Screening Should Include:– Laboratory studies to include serum creatinine

and eGFR– Urinalysis to determine the presence of

proteinuria– Imaging studies such as ultrasound

Screening recommendations are provided in KDOQI, Guideline 1

http://www.kidney.org/professionals/kdoqi/guidelines_ckd/toc.htm

Presence of MAU Indicates a Potential Increased Risk for CV Events

MAU30-299 mg/day

Increased CV Risk and VascularDysfunction

Urin

ary

Albu

min

(mg/

day)

Normal

0

100

200

300

400

500

600

700

800

900

1,000

Macroalbuminuria>300 mg/dayIncreased CV Risk and Presence of Renal and Vascular Dysfunction

Garg JP et al. Vasc Med. 2002;7:35-43. Eknoyan G et al. Am J Kidney Dis. 2003;42:617-622.

Cardiovascular Risk

34

Make the Diagnosis of Kidney Disease

• CriteriaThe ICD9 Code for CKD is 585.x where x = stage The ICD 9 Code for ARF is 584.9

Decreased kidney functioneGFR of <60 ml/min/1.73 m2 for ≥ 3 months

Abnormal urinalysis including the presence of proteinuria or hematuria

Request a spot urine protein/creatinine ratio(Normal is <30 mg/g)

Document an abnormal Renal Imaging Study

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How to Implement Timely Referral?• Establish CKD diagnosis and Details:

– Make a specific renal disease diagnosis if possible– Identify co-morbidities

• Hypertension• Diabetes• Cardiovascular Disease

– Determine the severity of CKD (know the eGFR)– Identify CKD Complications

• Anemia (know the Hgb)• Secondary Hyperparathyroidism (know the Ca and Phos)• Malnutrition (know the albumin)

– Assess stability of Kidney Function and CKD Stage

Recommendations for further evaluation are outlined in KDOQI Guideline 2http://www.kidney.org/professionals/kdoqi/guidelines_ckd/toc.htm

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Timely Referral Decision Making

• Timely Referral Guidance:

– Rapidly decreasing renal function REFER

– Abnormal eGFR AND proteinuria REFER

– eGFR ≤ 30 ml/min/ 1.73 m2 REFER

– eGFR <60 ml/min/1.73 m2 and Cardiovascular Disease Present REFER

– Uncontrolled Hypertension Present REFER

Reason for Nephrology Consultationin the Hospitalized patient

Reason for Nephrology Consultationin the Hospitalized patient

60%60%

15%15%

25%25%

Ref: Paller Sem Neph 1998, 18(5), 524.Ref: Paller Sem Neph 1998, 18(5), 524.

Acute Dialysis Quality Initiative

• RIFLE Criteria Helps risk stratify patients with acute renal failure.

• Increased mortality seen with increases in creatinine of 0.3 to 0.5 mg/dl – 70 % increase for all inpts, – 300 % increase in cardiac surgery pts

Acute Renal Failure

• Definition may depend on whom you ask– Surgeon - - low urine output– Intensivist-- severe acidemia– Nephrologist-- rising serum creatinine

• Frequency - depends on clinical setting– 1% of all admissions to hospital– 2-5% of all individuals during a

hospitalization– 4-15% during cardiopulmonary bypass– 10-30% of all admissions to ICU

Definition

• ‘…a sudden and severe decrease in the glomerular filtration rate (GFR) sufficient to cause increases in BUN and Scr (azotemia), Na/H2O retention (edema), and development of acidemia and hyperkalemia…’

• review of 27 studies showed no 2 used the same definition “chronic renal confusion”

What’s in a name?

• lack of a universally recognized definition of ARF

• 2004 consensus conference– proposed the term acute kidney injury

(AKI) to reflect the entire spectrum of ARF recognizing that an acute decline in kidney function is often secondary to an injury that causes functional or structural changes in the kidneys

Newest Definition:Mehta CritCare 2007

• An abrupt (within 48 h) reduction in kidney function currently defined as:– an absolute increase in serum creatinine

of either >= 0.3 mg/dl, – or a percentage increase of >= 50 % or

a reduction in UOP (documented oliguria of < 0.5 ml/kg per h for > 6)

RIFLE criteria

• Risk low uop for 6 hours, creat up 1.5 to 2 times baseline

• Injury creat up 2 to 3 times baseline, low uop for 12 hours

• Failure Creat up > 3 times baseline or over 4, anuria

• Loss of Function Dialysis requiring for > 4 weeks

• ESRD Dialysis requiring for > 3 months

RIFLE estimate of Mortality

• Two studies Uchino Hoste• No renal failure 4.4 % 5.5• Risk 15% 8.8• Injury 29% 11.4• Failure 53.9% 26%• Loss of Function• ESRD

Crit Care Med 2006; 34:1913-7, Hoste CCM 2006; 10:R73

RIFLE criteria

• When markers of severity of illness are looked at excluding renal data, no difference in groups is seen.

The differential for any lab abnormality is:

• Lab error• Lab error• Lab error• Iatrogenic• Polypharmacy• Real disease• IN THIS ORDER!

Acute renal failure (ARF)

• Differential for Lab abnormality: Causes:– A rise in the BUN level can occur without renal

injury, such as in GI or mucosal bleeding, steroid use, or protein loading (such as IV nutrition)

– A rise in the creatinine level can result from medications (eg, cimetidine, trimethoprim) that inhibit the kidney’s tubular secretion, or an increase in creatinine production such as seen in Rhabdomyolysis. (muscle breakdown)

– True Anuria is most commonly the result of an obstructed foley catheter, or an error in recording output. The worst cause of anuria is cortical necrosis.

Acute renal failure (ARF)

• An abrupt or rapid decline in renal function

• Marked by a rise in BUN (azotemia) or serum creatinine concentration– Immediately after a kidney injury, BUN

or creatinine levels may be normal• The only sign of a kidney injury may be

decreased urine production• Use RIFLE Criteria to evaluate Risk.

Acute renal failure (ARF)• History and Physical examination:

– Nephrotoxic drug ingestion – History of trauma or unaccustomed exertion – Blood loss or transfusions– Congestive heart failure– Exposure to toxic substances, such as ethyl

alcohol or ethylene glycol

Acute renal failure (ARF)

• History and Physical examination:– Exposure to mercury vapors, lead,

cadmium, or other heavy metals, which can be encountered in welders and miners

– Hypotension– Volume contraction

• Vomiting/Diarrhea/Sweating/Nursing Home

– Evidence of connective tissue disorders or autoimmune diseases

Pathophysiology

• ARF may occur in 3 clinical patterns

BUN:Cr > 20:1

BUN:Cr 10-20:1

BUN:Cr > 20:1

Pathophysiology• ARF may occur in 3 clinical patterns• Suggested by labwork:

BUN:Cr > 20:1 Pre-Renal or Post-Renal

BUN:Cr 10-20:1 Intra-Renal

BUN:Cr < 10:1 Extrinsic Production of Creatinine (rhabdomyolysis),

this pattern also seen in dialysis patients)

Prerenal ARF

• Prerenal ARF represents the most common form of kidney injury and often leads to intrinsic ARF if it is not promptly corrected

• From any form of extreme volume loss – GI, renal (Vomiting, Diarrhea, diuretics, polyuria),

cutaneous (eg, burns), and internal or external hemorrhage can result in this syndrome

• Systemic vasodilation or decreased renal perfusion

• Anesthetics • Drug overdose • Heart failure• Shock (eg, sepsis, anaphylaxis)

Approach to ARF

• Pre-Renal– Most common– Due to NPO, Diuretics, ACE inhibitors,

NSAIDS– Due to renal artery disease, CHF with

poor EF.– Usually BUN / creat ratio over 20.– Usually creat < 2.5

Approach to ARF

• Intra-Renal– Most commonly pre-renal tipping over

into true renal injury.– Acute Tubular Necrosis is result (70%)– Tubulo-Interstitial Nephritis (20%)– Acute vasculitis/GN rare (5-10 %)

Intrinsic Renal Failure

• Intrinsic ARF– acute tubular necrosis– acute interstitial nephritis– acute glomerulonephritis– acute vascular syndromes– intratubular obstruction

• BUN:Creat ratio 10-20 :1• In Pre-renal ARF, once creat is > 2.5,

there is some degree of ATN

Intrinsic ARFUrinalysis

• Intra-Renal– Acute Tubular Necrosis (70%)

• Dirty brown casts, low UOP

– Tubulo-Interstitial Nephritis (20%)• Eosinophils in blood or urine, • Potassium out of proportion to creat.• Normal BP, related to drug exposure

– Acute vasculitis/GN rare (5-10 %)• Proteinuria, hematuria, RBC casts

Approach to ARF

• Post- Renal– Most commonly due to obstruction at

bladder outlet• Prostate problems• Neurogenic bladder• Stone• Urethral stricture (esp after CABG)

Acute Renal failure

Hyperkalemia ( ECG abnormalities)

Decreased bicarbonate (acidosis)

Elevated urea

Elevated creatinine

Elevated uric acid

Hypocalcaemia

Hyperphosphatemia

Accumulation and toxicity of medications

secreted by the kidney

Complications of acute renal failure

Documentation for ARF

• List the ARF N17.9• Cause of the ARF (ATN N17.0)• Underlying CKD with stage if present N18.X• Volume status

– Volume overloaded E 87.7 or dry E 86• Electrolyte abnormalities

– Hyperkalemia E 87.5 / hyponatremia E 87.1• Acid base status – acidosis E 87.2 or alkalosis E 87.3• Estimated GFR: < 30 ml/min means many meds need to be

adjusted

Transplant Specifics

• Just because your patient has a transplant, they still have Chronic Kidney disease.– List the transplant– List the CKD stage for chronic allograft dysfunction– List acute allograft dysfunction if present– List the cause of their underlying CKD/ESRD– List comorbidities and complications

• Are they anemic due to Cellcept use?• Did they develop NODAT?

Doc talk, Precyse University, Oct 2013

PCKD specifics

• PCKD Q 61.3• Acquired cyst N 28.1• Q 60-64 Congenital Malformations of the

urinary System• Autosomal Dominant or recessive?• Liver /other cysts?

One common Cause of ARF

• Contrast Induced nephropathy CIN

Risk Factors for Contrast Nephropathy

• Age over 60• Diabetes• Pre-Renal States

– CHF– NSAIDS, ACE Inhibitors, Diuretics

• Proteinuria Includes, but not limited to Myeloma.

• Pre-existing Renal Disease

Risk of CN By Stage of CKD

< 20 ml/min 20 – 30 30 – 60 > 60

CKD Stages

• Stage 1. Normal function with known dz• Stage 2. GFR 60-80• Stage 3. GFR 30-60• Stage 4. GFR 15-30.• Stage 5. GFR less than 15.• Stage 6. ESRD on dialysis.

Progression of CRF

How do you differentiate ARF from CRF.

• What physical exam finding tells you the pt has Chronic Kidney Disease?

• What Would you see on renal Imaging for a pt with CKD?

Lindsey’s Nails

Acute vs Chronic Renal Failure

Atrophic Kidney on CT