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61. Nass Summary Stats Supplemental 2022 (pdf file)
    hcup-us.ahrq.gov/db/nation/nass/stats/NASS_Summary_Stats_Supplemental_2022.pdf
    January 01, 2022 - 998: CPT codes not classified (F codes) 655 0.01% SupCPTCCS6 Frequency Percent of Total .: Missing … 107 0.00% 998: CPT codes not classified (F codes) 504 0.01% SupCPTCCS7 Frequency Percent of Total … 27.27% 245: Telehealth 57 0.00% 998: CPT codes not classified (F codes) 238 0.00% NASS Summary … 1-244: CCS category 609,662 8.90% 245: Telehealth 18 0.00% 998: CPT codes not classified (F codes … CPT codes <= 10 *.**% 1-244: CCS category 433,570 6.33% 245: Telehealth <= 10 *.**% 998: CPT codes

62. Weighted Summary Statistics: PUF Commercial Outpatient File (Version 2) (pdf file)
    www.ahrq.gov/sites/default/files/wysiwyg/data/SyH-DR-PUF-Summary-Statistics-Commercial-Outpatient-Weighted.pdf
    September 26, 2023 - Imputed Flag PRMRY_DX_IMPUTED Frequency Percent Cumulative Frequency Cumulative Percent No DX codes … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 88 0.00 195,877,110 100.00 … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 44 0.00 195,877,110 100.00 … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 28 0.00 195,877,110 100.00 … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 20 0.00 195,877,110 100.00

63. 2015HCUPNationalInpatientSample (pdf file)
    hcup-us.ahrq.gov/db/nation/nis/2015HCUPNationalInpatientSample.pdf
    September 28, 2022 - Files, Q1Q3 with ICD-9-CM Codes and Q4 with ICD-10-CM Codes ....... 4 Table 2. … , Q1Q3 with ICD-9-CM Codes and Q4 with ICD-10-CM/PCS Codes ..... 6 HCUP (9/28/2022) 1 2015 HCUP NIS … The Q1Q3 file includes diagnosis and procedure codes in addition to data elements based on ICD-9-CM codes … Files, Q1Q3 with ICD-9-CM Codes and Q4 with ICD-10- CM Codes HCUP Data Element Descriptiona ICD- … , Q1Q3 with ICD-9-CM Codes and Q4 with ICD-10- CM/PCS Codes HCUP Data Element Descriptiona ICD-9

64. User Guide (v2025.1) for Clinical Classifications Software Refined (CCSR) for ICD-10-CM (pdf file)
    hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-User-Guide-v2025-1.pdf
    November 01, 2024 - If a category contains a mix of codes (i.e., codes that do not contain a 7th character and codes with … Number of ICD-10-CM Codes (Percent of Total) Codes assigned to only one category 66,348 (88.2%) … Codes assigned to two categories 6,538 (8.7%) Codes assigned to three categories 1,742 (2.3%) Codes … each fiscal year update to ICD-10- CM codes Valid for ICD-10-CM diagnosis codes from October 1, … Number of ICD-10-CM Codes (Percent of Total) All ICD-10-CM codes through FY 2025 75,238 (100%)

65. DXCCSR-ChangeLog-v20212-v20221 (xls file)
    hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-ChangeLog-v20212-v20221.xlsx
    October 01, 2021 - that have modifications to the category description Changes to the mapping of ICD-10-CM diagnosis codes … to CCSR category List of ICD-10-CM diagnosis codes that are mapped into a different CCSR category … List of ICD-10-CM diagnosis codes for which the default CCSR category for the inpatient principal diagnosis … diagnosis changed List of ICD-10-CM diagnosis codes that were added to the CCSR tool New_CCSR_category … Other specified nervous system disorders Change_DX_to_CCSR_mapping List of ICD-10-CM diagnosis codes

66. LOINC | Digital Healthcare Research
    digital.ahrq.gov/loinc
    January 01, 2023 - LOINC codes are based on a six-part name, which means that codes are unique not just to the component … During a 12-month period, 4,000 codes accounted for almost 49 million clinical results. … Of the total codes identified, 80 (2 percent) codes accounted for 80 percent of the results, and 784 … (19 percent) codes account for 99 percent of the results. … LOINC by initially focusing on a subset of high-volume transaction codes.

67. Measure 1, Section 2, Attachment 6 (pdf file)
    www.ahrq.gov/sites/default/files/wysiwyg/policymakers/chipra/factsheets/fullreports/chipra-88-measure-1-section-2-attachment-6.pdf
    June 02, 2025 - through 18 with an ADHD diagnosis code (314.0) at a physician visit (see Table 1 for list of acceptable codes … Patients should have an assessment code (see Table 2 for list of assessment codes) at the office visit … Description CPT Codes Office or Other Outpatient Services 99201–99215 Hospital Observation Services … Medicine Services 99381–99429 Other E&M Services 99450–99456, 99354–99357 Table 2: Assessment Codes … Description CPT Codes Developmental testing; extended (includes assessment of motor, language,

68. Healthcare Cost and Utilization Project (HCUP) NASS Notes
    hcup-us.ahrq.gov/db/vars/dxccsr_default_dx1/nassnote.jsp
    August 01, 2019 - These codes do not have a default categorization assigned. … Examples of codes included in this group are external causes of morbidity codes (i.e., codes beginning … with V00-Y99), underdosing codes (i.e., codes beginning with T36-T50 with fifth or sixth character " … 6"), and adverse effect codes (i.e., codes beginning with T36-T50 with fifth or sixth character "5"). … Examples of codes included in this group are external causes of morbidity codes, underdosing codes, and

69. Assessing the Impact of Indexing Performance Measure Codes on the Perceived Value of EPC Reports to Health Systems | Effective Health Care (EHC) Program
    effectivehealthcare.ahrq.gov/products/performance-measure-codes/method-report

70. Clinical Classifications Software Refined (CCSR)
    hcup-us.ahrq.gov/toolssoftware/ccsr/ccs_refined.jsp
    November 01, 2024 - The beta version of the CCS of ICD-10-CM/PCS codes will not be updated for newer codes (ICD-10-CM codes … after October 2019 and ICD-10-PCS codes after October 2020). … 10-CM Diagnoses The CCSR for ICD-10-CM diagnoses aggregates more than 70,000 ICD-10-CM diagnosis codes … Some diagnosis codes are cross classified into more than one category because individual ICD-10-CM codes … Key features of the CCSR for ICD-10-PCS include: All ICD-10-PCS codes valid from October 2015 to

71. Validation of AHRQ’s Patient Safety Indicator for Accidental Puncture or Laceration (pdf file)
    www.ahrq.gov/sites/default/files/wysiwyg/professionals/quality-patient-safety/patient-safety-resources/resources/advances-in-patient-safety/vol2/Gallagher1.pdf
    January 01, 2004 - Cases of APL that were missed by the PSI were identified using procedure codes. … The PSI also misses cases of APL by failing to use procedure codes in the algorithm. … are diagnosis codes; all others are procedure codes. … The APL PSI relies on a single diagnosis code and 10 external cause-of-injury codes (E-codes) to identify … in a secondary field and 16 procedure codes in a secondary field to identify patients.

72. Research Tools
    hcup-us.ahrq.gov/tools_software.jsp
    July 01, 2025 - Classification of Diseases, 10th Revision, Clinical Modification/Procedure Coding System (ICD-10-CM/PCS) codes … Classifications Software Refined (CCSR) CCSR for ICD-10-CM Diagnoses Groups diagnosis codes … 530 clinical categories CCSR for ICD-10-PCS Procedures Groups procedure codes … Clinical Classifications Software (CCS) for Services and Procedures Groups codes into … over 240 clinical categories Surgery Flags for Services and Procedures Identifies codes

73. User Guide: Clinical Classifications Software Refined (CCSR) (pdf file)
    hcup-us.ahrq.gov/toolssoftware/ccsr/DXCCSR-User-Guide-v2019-1.pdf
    September 01, 2019 - ICD-10-CM consists of more than 70,000 diagnosis codes. … Cross-classified codes (i.e., codes mapped to more than one CCSR category) are not designed to be hierarchical … For example, several Z codes are exclusively assigned to a CCSR category with codes under Pregnancy, … Assignment Number of ICD-10-CM Codes Codes assigned to only one category 64,791 (89.4%) Codes assigned … to two categories 5,728 (7.9%) Codes assigned to three categories 1,535 (2.1%) Codes assigned to four

74. ICD-10 codes used to identify adverse drug events in administrative data: a systematic review. | PSNet
    psnet.ahrq.gov/issue/icd-10-codes-used-identify-adverse-drug-events-administrative-data-systematic-review
    September 14, 2016 - Review ICD-10 codes used to identify adverse drug events in administrative data: … ICD-10 codes used to identify adverse drug events in administrative data: a systematic review. … adverse drug events by searching administrative data and found that more than 800 different ICD-10 codes … could be used to detect medication errors, with the combination of codes varying widely across studies … ICD-10 codes used to identify adverse drug events in administrative data: a systematic review.

75. User Guide (v2025.1) for Clinical Classifications Software Refined (CCSR) for ICD-10-PCS (pdf file)
    hcup-us.ahrq.gov/toolssoftware/ccsr/PRCCSR-User-Guide-v2025-1.pdf
    November 01, 2024 - broad range of codes, to the extent possible. … There are three key differences between ICD-10-PCS and ICD-9-CM procedure codes: • ICD-10-PCS codes … ICD-10-PCS codes are updated each year with new codes becoming effective on October 1. … ICD-10-PCS procedure codes are represented by 7 alphanumeric codes. … fiscal year update to ICD-10-PCS codes Valid for ICD-10-PCS procedure codes from October 1, 2015

76. Change log for Surgery Flags Software for Services and Procedures, v2025.1 (xls file)
    hcup-us.ahrq.gov/toolssoftware/surgeryflags_svcproc/SF-SvcProc-ChgLg-v20241-v20251.xlsx
    June 01, 2025 - 2025) Table of Contents Comparison of the surgery flag assignments by type of HCPCS Level I (CPT) codes … Our license agreement prohibits the listing of individual CPT codes with labels. … End of content Compare_SurgeryFlag_Code_Counts Comparison of the Number of HCPCS Level I (CPT) Codes … in v2024.1, but is included in v2025.1 (code valid on 1/1/2025) Surgery (10004-69990) Number of CPT Codes … designation 0 Discontinued code 13 New code 33 Radiology procedures (70000-79999) Number of CPT Codes

77. Weighted Summary Statistics: PUF Commercial Inpatient File (Version 2) (pdf file)
    www.ahrq.gov/sites/default/files/wysiwyg/data/SyH-DR-PUF-Summary-Statistics-Commercial-Inpatient-Weighted.pdf
    September 26, 2023 - 99.99 T1000-T5999: National Codes Established for State Medicaid Agencies 456 0.00 9,536,760 100.00 … 1,372 0.01 9,536,046 99.99 S0012-S9999: Temporary National Codes (Non-Medicare) 688 0.01 9,536,733 … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 61 0.00 9,536,794 100.00 … 1,246 0.01 9,536,010 99.99 S0012-S9999: Temporary National Codes (Non-Medicare) 705 0.01 9,536,714 … 100.00 T1000-T5999: National Codes Established for State Medicaid Agencies 80 0.00 9,536,794 100.00

78. NIS Description of Data Elements
    hcup-us.ahrq.gov/db/nation/nis/nisdde.jsp
    February 01, 2025 - for ICD-9-CM Elixhauser Comorbidity Software for ICD-9-CM Utilization Flags for Revenue Center Codes … single file containing commonly used data elements (e.g., age, expected primary payer, ICD-10-CM/PCS codes … body system 2005-2013 Dx_Pr_Grps   CM_AIDS AHRQ comorbidity measure for ICD-9-CM codes … Q3 Severity Q1Q3 Severity (not in Q4) CM_ARTH AHRQ comorbidity measure for ICD-9-CM codes … *Beginning with 2017, external cause codes are at the end of the ICD-10-CM diagnosis array.

79. Follow-up Visits for Children Who Are Obese or Overweight with a Weight-Related Comorbidity: Tables 1-3 (pdf file)
    www.ahrq.gov/sites/default/files/wysiwyg/pqmp/measures/chronic/chipra-0242-tables1-3.pdf
    June 02, 2025 - Documentation of Weight Addressed Table 2: ICD-9 Codes for Weight-Related Comorbidities Description … Diabetes 250.xx Hyperlipidemia 272.0, 272.1, 272.2, 272.3, 272.4 Hypertension 401 Table 3: Codes … Documentation of Weight Addressed Table 2: ICD-9 Codes for Weight-Related Comorbidities Table 3: Codes

80. Downloading Information
    hcup-us.ahrq.gov/toolssoftware/surgeryflags_svcproc/surgeryflagssvc_proc_downloading.jsp
    June 18, 2025 - Surgery Flags Software for Services and Procedures Tool depends on the data year for which the CPT codes … Calendar Year 2025 v2025.1 for CPT Codes Valid in Calendar Year 2025 The ZIP folder includes … to v2025.1 (Excel file, 21 KB) Calendar Year 2024 v2024.1 for CPT Codes … Valid in Calendars Year 2018-2019 , Released October 2020 The mapping of codes into Surgery … and the revised coding of surgical codes.