Knowledge Base Article

CMS issued the FY 2023 IPPS Proposed Rule (CMS-1762-IFC) display copy on Monday April 18, 2021. You can find a high level review of what is being proposed in a related MMP article by clicking here. This article focuses on three proposals in section II. Proposed Changes to Medicare Severity Diagnosis-Related Group (MS-DRG) Classifications and Relative Weights, of the Proposed Rule. Each MS-DRG refinement synopsis includes the potential financial impact if the proposal is finalized.

Calculating the potential financial impact was accomplished through a collaboration with RealTime Medicare Data (RTMD). RTMD’s database currently includes Medicare Fee-for-Service paid claims data for all U.S. states and territories except Kentucky and Ohio. RTMD claims analysis in this article represents Medicare Fee-for-Service paid claims data for CY 2021 in the RTMD footprint

Acute Respiratory Distress Syndrome (ARDS)M

CMS received a request to reassign cases reporting diagnois code J80 (Acute respiratory distress syndrome) as the principal diagnosis from MS-DRG 204 (Respiratory Signs and Symptoms) to MS-DRG 189 (Pulmonary Edema and Respiratory Failure). The requestor noted that in the ICD-10-CM Tabular List of Diseases, per the Excludes 1 note under category J96 (Respiratory Failure, not elsewhere classified) only code J80 should be assigned when respiratory failure and ARDs are both documented. Currently, a principal diagnosis of J80 groups to MS-DRG 204.

CMS data analysis supports that cases reporting ARDS (J80) are more appropriately aligned with the average length of stay and average costs of the cases in MS-DRG 189 and they have proposed to reassign cases with ARDS (code J80) as the principal diagnosis from MS-DRG 204 to MS-DRG 189.

RTMD Claims Analysis

In Calendar Year (CY) 2021, in the RTMD database, there were 255 claims sequenced to MS-DRG 204 (Respiratory Signs and Symptoms) with a principal diagnosis of J80 (ARDS). Based on the CMS FY 2022 Final Rule, the shift from MS-DRG 204 to MS-DRG 189 would result in:

• An increase in the MS-DRG Relative Weight (R.W.) of 0.4325, and
• An increase in the MS-DRG National Average Payment of $2,612.56.

For the 255 claims with a principal diagnosis of J80 (ARDS) in CY 2021, the reassignment to MS-DRG 189 would results in a $666,202.80 increase in payment for this group of claims.

Cardiac Mapping

CMS identified a replication issue from ICD-9 based MS-DRGs to ICD-10 based MS-DRGs for procedure code 02K80ZZ (Map conduction mechanism, open approach). Cardiac mapping describes the creation of detailed maps to detect how the electrical signals that control the timing of the heart rhythm move between each heartbeat to identify the location of rhythm disorders. Cardiac mapping is generally performed during open-heart surgery or performed via cardiac catheterization.

This code is currently recognized as a non-O.R. procedure that affects the MS-DRG to which it is assigned. CMS is proposing to reassign this code from MS-DRGs 246, 247, 248, 249, 250, and 251 to MS-DRGs 273 and 274 (Percutaneous and Other Intracardiac Procedures with and without MCC, respectively)

RTMD Claims Analysis

There were no claims in the RTMD database for CY 2021 where MS-DRGs 246, 247, 248, 249 and 250 included procedure code 02K80ZZ (Map conduction mechanism, open approach).

Laparoscopic Cholecystectomy with Common Bile Duct Exploration

A requestor noted that when a laparoscopic cholecystectomy is reported with any one of the listed procedure codes with a common bile duct exploration and gallstone removal procedure that is performed laparoscopically and reported with procedure code 0FC94ZZ, the resulting assignment is MS-DRGs 417, 418 and 419 (Laparoscopic Cholecystectomy without C.D.E. with MCC, with CC, and without CC/MCC, respectively). This MS-DRG assignment does not recognize that a common bile duct exploration (C.D.E.) was performed.

CMS’ clinical advisors agreed that procedure code 0FC94ZZ describes a common bile duct exploration procedure with removal of a gallstone and should be added to the logic for case assignment to MS-DRGs 411, 412, and 413 for clinical coherence with the other procedures that describe a common bile duct exploration. CMS has proposed to redesignate procedure code 0FC94ZZ from a non-O.R. procedure to an O.R. procedure and add it to the logic list for common bile duct exploration (CDE) in MS-DRGs 411, 412, and 413 (Cholecystectomy with C.D.E. with MCC, with CC, and without CC/MCC, respectively).

RTMD Claims Analysis

In CY 2021, in the RTMD database, there were 188 claims that sequenced to the MS-DRG group 417, 418, and 419 (Laparoscopic Cholecystectomy without C.D.E. with MCC, with CC, and without CC/MCC respectively) that included the procedure code 0FC94ZZ describing a common bile duct exploration procedure with removal of a gallstone.

Based on the CMS FY 2022 Final Rule, following are the shifts in R.W. and national average payment by DRG severity levels:

• The increase from MS-DRG 417 to MS-DRG 411 (Chlecystectomy w/C.D.E. w/MCC) in R.W. is 1.3120 and national average payment of $8,029.19,
• The increase from MS-DRG 418 to MS-DRG 412 (Cholecystecomy w/C.D.E. w/CC) in R.W. is 0.5885 and national average payment of $3,554.90, and
• The increase from MS-DRG 419 to MS-DRG 413 (Cholecystecomy w/C.D.E. w/o CC/MCC) in R.W. is 0.4156 and national average payment of $2,510.48.

I encourage key stakeholders take the time to review the proposed rule and remember that CMS is accepting comments on the proposed rule through 5 p.m. EDT on June 17, 2022.

Resources

• CMS FY 2023 IPPS Proposed Rule CMS Fact Sheet: https://www.cms.gov/newsroom/fact-sheets/fy-2023-hospital-inpatient-prospective-payment-system-ipps-and-long-term-care-hospitals-ltch-pps
• CMS FY 2023 Proposed Rule web page: https://www.cms.gov/medicare/acute-inpatient-pps/fy-2023-ipps-proposed-rule-home-page