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  1. hcup-us.ahrq.gov/reports/statbriefs/sb230-7-Day-Versus-30-Day-Readmissions.pdf
    December 01, 2016 - Top 20 principal diagnoses with the highest 7-day and 30-day readmission rates, 2014 Principal diagnosis … The principal diagnosis is grouped using the Clinical Classification Software (CCS). … This varied by the principal diagnosis at the index stay. … rates, but this diagnosis did not rank in the top five for 30-day readmissions. … Definitions Diagnoses and Clinical Classifications Software (CCS) The principal diagnosis is that
  2. hcup-us.ahrq.gov/db/quality.jsp
    April 01, 2022 - ICD-9-CM DIAGNOSIS AND PROCEDURE SCREENS Maternal Neonate Male Diagnoses Male … ICD-10-CM Diagnoses EDX01 NO PRINCIPAL DIAGNOSIS CODED ON THE RECORD There is no principal … diagnosis is invalid as a discharge diagnosis as indicated by the assignment of Diagnosis Related Group … Diagnoses EDX01 NO PRINCIPAL DIAGNOSIS CODED ON THE RECORD There is no principal diagnosisDiagnoses and Procedures EDXPR01 MIXED MATERNAL AND NEONATAL RECORD Codes in the diagnosis
  3. hcup-us.ahrq.gov/reports/statbriefs/sb230-7-Day-Versus-30-Day-Readmissions.jsp
    October 01, 2017 - Readmission rates reported by diagnoses reflect the principal diagnosis at the index (i.e., initial) … The principal diagnosis is grouped using the Clinical Classification Software (CCS). … This varied by the principal diagnosis at the index stay. … rates, but this diagnosis did not rank in the top five for 30-day readmissions. … Definitions Diagnoses and Clinical Classifications Software (CCS) The principal diagnosis is
  4. hcup-us.ahrq.gov/datainnovations/clinicaldata/MNPOAvideotranscript.pdf
    September 24, 2010 - The letter “Y” indicates that the diagnosis was present at the time the  order to admit a patient was … In other words, the letter “N” indicates  that a diagnosis is a hospital‐acquired complication.    …  on admission and is included among a patient’s discharge diagnoses.   … Next slide on screen:  Coding Uncertain Diagnoses  6        Michael speaking:  Diagnoses documented … Therefore the coder was forced to  code this diagnosis as hospital‐acquired.  
  5. hcup-us.ahrq.gov/reports/statbriefs/sb162.pdf
    March 01, 2013 - The principal diagnosis is the condition primarily responsible for the patient’s admission. … A diagnosis of mood disorders, the only mental health diagnosis on the list, was the sixth most common … Some of the most frequent diagnoses were specific to individual payers; however, other diagnoses were … Definitions Diagnoses, ICD-9-CM, and Clinical Classifications Software (CCS) The principal diagnosis … There are approximately 14,000 ICD-9-CM diagnosis codes.
  6. hcup-us.ahrq.gov/reports/statbriefs/sb202-Mental-Substance-Use-Teenagers.pdf
    November 01, 2015 - MD and SUD diagnoses are based on any principal or secondary (all-listed) diagnosis or external cause … stay MD or SUD diagnosis No MD or SUD diagnoses MD alone SUD alone Co-occurring M/SUDs … SUD diagnoses. … teenagers by diagnosis, 2012 Diagnosis Number of stays (both sexes) Stays per 100,000 male … All-listed diagnoses include the principal diagnosis plus these additional secondary conditions.
  7. hcup-us.ahrq.gov/db/vars/ndx/kidnote.jsp
    September 01, 2008 - there is a secondary diagnosis present (see table below). … diagnosis (DX1) is coded. … All secondary diagnoses are blank. 2 One secondary diagnosis (DX2) is coded. … The first listed diagnosis (DX1) may be coded or blank. 3 The second and third diagnoses (DX2 … The first listed diagnosis (DX1) may be coded or blank.  
  8. hcup-us.ahrq.gov/db/vars/ndx/nrdnote.jsp
    August 01, 2015 - there is a secondary diagnosis present (see table below). … diagnosis (DX1) is coded. … All secondary diagnoses are blank. 2 One secondary diagnosis (DX2) is coded. … The first listed diagnosis (DX1) may be coded or blank. 3 The second and third diagnoses (DX2 … The first listed diagnosis (DX1) may be coded or blank.  
  9. hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-vs-Beta-CCS-Comparison.pdf
    January 01, 2020 - The CCSR for ICD-10-CM diagnoses replaces the beta version of the CCS for ICD-10-CM diagnoses. … to the CCSR for ICD-10-CM diagnoses by category and by individual diagnosis codes. … • Differences of more than 10 ICD-10-CM diagnosis codes within categories. … ICD-10-CM Diagnosis Codes There are 35 beta version CCS categories with no difference in ICD-10-CM diagnosis … No Differences in ICD-10-CM Diagnosis Codes Differences of Ten or Fewer Total ICD-10-CM Diagnosis
  10. hcup-us.ahrq.gov/toolssoftware/ccs/ccsfactsheet.jsp
    September 01, 2025 - , Clinical Modification (IDC-9-CM), which contains more than 14,000 diagnosis codes and 3,900 procedure … Single-level CCS This system classifies all diagnoses and procedures into unique groups. … Examples of single-level CCS diagnosis categories are illustrated in Table 1. Table 1. … Examples of single-level CCS diagnosis categories     98. … Examples of multi-level CCS diagnosis categories     7.
  11. hcup-us.ahrq.gov/reports/statbriefs/sb202-Mental-Substance-Use-Teenagers.jsp
    March 01, 2016 - MD and SUD diagnoses are based on any principal or secondary (all-listed) diagnosis or external cause … M/SUD-related stay MD or SUD diagnosis No MD or SUD diagnoses MD alone SUD alone Co-occurring … teenagers by diagnosis, 2012 Diagnosis Number of stays (both sexes) Stays per 100,000 male … All-listed diagnoses include the principal diagnosis plus these additional secondary conditions. … MDCs assign ICD-9-CM principal diagnosis codes to one of 25 general diagnosis categories.
  12. hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-User-Guide-v2019-1.pdf
    September 01, 2019 - The Version 2019.1 release of the CCSR for ICD-10-CM diagnoses is based on ICD-10-CM diagnosis codes … CM diagnoses, and the CCS for ICD-9-CM diagnoses. … Beta Versions of the CCS for ICD-10-CM Diagnoses CCS for ICD-9-CM Diagnoses More than 70,000 ICD … diagnoses, or both types of diagnoses but does not retain the exact position of the ICD-10-CM diagnosisdiagnosis on the input record
  13. Section2 1 (pdf file)

    hcup-us.ahrq.gov/reports/factsandfigures/2008/pdfs/section2_1.pdf
    January 01, 2008 - for Inpatient Hospital Stays, 1997 and 2008 PRINCIPAL CCS DIAGNOSIS NUMBER OF DISCHARGES IN …  Normal pregnancy and delivery stays declined by 49 percent and stays with a principal diagnosis of …  Stays with a principal diagnosis of high blood pressure during pregnancy increased by 22 percent … CCS principal diagnoses:  The 10 most frequent principal diagnoses outside of pregnancy, childbirth … ) were not among the most frequent diagnoses in 1997.
  14. hcup-us.ahrq.gov/db/nation/nis/2015HCUPNationalInpatientSample.pdf
    September 28, 2022 - Names of Data Elements Based on Diagnoses and Procedure Codes in the Disease Severity Measures Files … derived from diagnoses and procedures, have been moved out of the Core File and into the Diagnosis and … such as Diagnosis Related Groups (DRGs), Clinical Classification Software (CCS) categories for diagnoses … File Data Elements based on Diagnoses Only Diagnoses DX1-DX30 I10_DX1-I10_DX30 Number of diagnoses … NDX I10_NDX Diagnosis version DXVER DXVER CCS for diagnoses DXCCS1-DXCCS30 Not availableb MCC for
  15. hcup-us.ahrq.gov/reports/statbriefs/sb162.jsp
    September 01, 2013 - The principal diagnosis is the condition primarily responsible for the patient's admission. … A diagnosis of mood disorders, the only mental health diagnosis on the list, was the sixth most common … A diagnosis of mood disorders was the most common reason for hospitalization among children aged 1–17 … Some of the most frequent diagnoses were specific to individual payers; however, other diagnoses were … There are approximately 14,000 ICD-9-CM diagnosis codes.
  16. hcup-us.ahrq.gov/reports/statbriefs/sb257-ED-Costs-Mental-Substance-Use-Disorders-2017.pdf
    January 01, 2017 - Diagnoses. … of MSUD diagnosis. … Diagnoses. … -CM Diagnoses For emergency department (ED) visits that are treated and released, the first-listed diagnosis … All-listed diagnoses include the first-listed (principal) diagnosis plus the secondary conditions.
  17. Ff 2009 Section2 (pdf file)

    hcup-us.ahrq.gov/reports/factsandfigures/2009/pdfs/FF_2009_section2.pdf
    January 01, 2009 - Statistics on Hospital-Based Care in the United States, 2009 22 SECTION 2 INPATIENT HOSPITAL STAYS BY DIAGNOSIS …  Liveborn (newborn infant) (4.2 million stays) was the most common diagnosis and accounted for more … ) were not among the most frequent diagnoses in 1997. … ) were not among the most frequent diagnoses in 1997. …  Pneumonia (643,000 Medicare stays in 2009) was the second most common diagnosis.
  18. hcup-us.ahrq.gov/reports/natstats/94drgb.htm
    September 01, 1997 - HCUP-3 Nationwide Inpatient Sample for 1994: Diagnosis-Related Groups Statistics from the … Nationwide Inpatient Sample for 1994 Hospital Inpatient Stays (continued) Diagnosis-related … 373 Vaginal delivery w/o 2,488,532 7.19 1.67 3,094 complicating diagnoses … 424 OR procedures w/ 9,305 0.03 20.48 21,417 principal diagnosesdiagnosis 470 Ungroupable 46,257 0.13 5.47 14,761 471
  19. hcup-us.ahrq.gov/db/nation/nass/nassknowndataissue_2021.jsp
    January 01, 2021 - Data Issue The 2021 NASS includes a maximum of 25 diagnosis codes. … The assignment of comorbidity and diagnosis CCSR data elements used only 20 of the possible 25 … diagnosis codes. … Correction of the Affected Records There are 113,560 records in the 2021 NASS with more than 20 diagnosis … To be affected, a record needed to have more than 20 diagnoses reported and have a diagnosis that
  20. hcup-us.ahrq.gov/db/vars/dxn/nedsnote.jsp
    May 01, 2015 - Starting at the first secondary diagnosis (DX2), the diagnoses are shifted during HCUP processing to … eliminate blank secondary diagnoses. … The number of such diagnoses eliminated from the principal diagnosis position will be smaller than it … than 30 diagnoses. … Beginning Q4 2015, the following codes were modified: Diagnosis Z33.2 was changed to Z31.9, Diagnoses

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