Knowledge Base Article

At least annually, DRG classifications and relative weights are adjusted to reflect changes in treatment patterns, technology, and other factors that may change the relative use of hospital resources. This week is the second article in our series about the 2020 IPPS Final Rule. This week highlights finalized changes to specific MS-DRG Classifications.

Pre-MDC

Extracorporeal Membrane Oxygenation (ECMO)

In FY 2019, three new procedure codes were finalized describing different types of ECMO treatments being used (central and peripheral). However, the codes were not finalized prior to the release of the FY 2019 IPPS Proposed Rule meaning there was no proposed Major Diagnostic Category (MDC), MS-DRG or O.R. vs. Non-O.R. designation made for the new codes.  

Given this unique situation, CMS Clinical Advisors reviewed the predecessor central ECMO code (5A15223) and determined the new peripheral codes should not sequence to Pre-MDC MS-DRG 3 where the central ECMO code is assigned.

Instead the new Peripheral ECMO codes were designated as Non-O.R. Procedures impacting MS-DRG assignment for specific medical MS-DRGs. The following table reflects the differences in ECMO Procedures DRG assignment:

In the FY 2020 IPPS Proposed Rule, stakeholders expressed the following concerns:

• MS-DRG assignment for ECMO should not be based on how the patient is cannulated as most of the cost can be attributed to a patient’s severity of illness,
• There was a lack of opportunity for public comment on the final MS-DRG assignments,
• Patient access to ECMO treatment and programs is now at risk because of inadequate payment, and
• CMS did not appear to have access to enough patient data to evaluate for appropriate MS-DRG assignment.

In the Final Rule CMS finalized the following proposals:

• Reassign the procedure codes describing peripheral ECMO procedures from their current MS-DRG assignments to Pre-MDC MS-DRG 003,
• Maintain the designation of the peripheral ECMO procedures as non-O.R., and
• Make changes to the titles for MS-DRGs 207, 291, 296, and 870 to no longer reflect the ECMO terminology in the title.

Allogenic Bone Marrow Transplant

A request was made to create new MS-DRGs for cases that would identify patients undergoing an allogeneic hematopoietic cell transplant (HCT) procedure according to the donor source (related or unrelated donor source). The requester indicated this would more appropriately recognize the clinical characteristics and cost differences in allogeneic HCT cases.

CMS data analysis of MS-DRG 014 cases reporting HCT related donor source, HCT unrelated donor source and unspecified donor source had comparable average length of stay and average costs. Thus, no proposal was made to create new MS-DRGs.

However, as a result of CMS’ review of procedure codes they proposed and finalized:

• The reassignment of 4 ICD-10-PCS codes for HCT procedures specifying autologous cord blood stem cell as the donor source from MS-DRG 014 to MS-DRGs 016 and 017, and
• Delete 128 clinically invalid codes from the transfusion table describing arterial access as transfusion procedures always use venous access rather than arterial access.

Chimeric Antigen Receptor (CAR) T-Cell Therapy

“Chimeric Antigen Receptor (CAR) T-cell therapy is a cell-based gene therapy in which a patient’s own T-cells are genetically engineered in a laboratory and used to assist in the patient’s treatment to attack certain cancerous cells. Blood is drawn from the patient and the T-cells are separated. The laboratory then utilizes the CAR process to genetically engineer the T-cells, resulting in the addition of a chimeric antigen receptor that will bind to a certain protein on the patient’s cancerous cells. The CAR T-cells are then administered to the patient by infusion.”

Two CAR T-cell therapy drugs received FDA approval in 2017 (KYMRIAH™ manufactured by Novartis Pharmaceuticals Corporation and YESCARTA™ manufactured by Kite Pharma, Inc.). Current ICD-10-PCS procedures codes involving the CAR T-cell therapy drugs includes:

• XW033C3 (Introduction of engineered autologous chimeric antigen receptor t-cell immunotherapy into peripheral vein, percutaneous approach, new technology group 3), and
• XW043C3 (Introduction of engineered autologous chimeric antigen receptor t-cell immunotherapy into central vein, percutaneous approach, new technology group 3).

Both ICD-10-PCS procedure codes became effective October 1, 2017 and are designated as non-O.R. procedures impacting MS–DRG assignment.

In FY 2019 CMS finalized the assignment of these procedure codes to Pre-MDC MS-DRG 016, revise the title of MS-DRG 016 to include “or T-cell immunotherapy,” and Car T-cell therapy was approved for a new technology add-on payment.

In the FY 2020 IPPS Proposed Rule, a request was made to create new MS-DRGs for CAR T-cell therapy. CMS does not believe enough data is available to make a change at this time. However, CMS has finalized the continuation of CAR-T cell therapy being eligible for new technology and add-on payments for FY 2020.

MDC 1: Diseases and Disorders of the Nervous System

Carotid Artery Stent Procedures

Current logic for case assignment to MS-DRGs 034, 035, and 036 (Carotid Artery Stent Procedures with MCC, with CC, and without CC/MCC respectively) “is comprised of two lists of logic that include procedure codes for operating room (O.R.) procedures involving dilation of a carotid artery (common, internal or external) with intraluminal device(s).”

CMS identified 46 ICD-10-PCS procedures codes in the second list that do not describe dilation of a carotid artery with intraluminal device. CMS finalized the proposal to remove these 46 codes from MS-DRGs 034, 035 and 036.

These 46 ICD-10-PCS codes are also assigned to MS-DRGs 037, 038, and 039 (Extracranial Procedures with MCC, with CC, and without CC/MCC, respectively.) Therefore, CMS also examined claims data for this MS-DRG group and finalized their proposals to:

• Remove 96 ICD-10-PCS procedure codes describing dilation of a carotid artery with an intraluminal device from the logic for MS-DRG group 037-038 and 039,
• Reassign 6 ICD-10-PCS procedure codes describing dilation of a carotid artery with an intraluminal device from MS-DRG group 037, 038 and 039 to MS-DRG group 034, 035, and 036,
• Delete 48 procedure codes from MS-DRGs 037, 038, and 039 that include the qualifier term “bifurcation;” and
• Combining all procedure codes identifying a carotid artery stent procedure within MS-DRGs 034, 035, and 036 into one list entitled “Operating Room Procedures” to better reflect the definition of the MS-DRGs.

MDC 4: Diseases and Disorders of the Respiratory System

Pulmonary Embolism

A request was made to reassign the following three ICD-10-CM diagnosis codes for Pulmonary Embolism (PE) with acute core pulmonale from MS-DRG 176 (PE without MCC) to MS-DRG 175 (PE with MCC):

• I26.01 – Septic pulmonary embolism with acute cor pulmonale,
• I26.02 – Saddle embolus of pulmonary artery with acute cor pulmonale, and
• I26.09 – Other pulmonary embolism with acute cor pulmonale.

The requestor noted with the FY 2019 IPPS Final Rule special logic change where a Principal Diagnosis could no longer be its own CC or MCC this resulted in these three codes being assigned to MS-DRG 176 when no other MCC is present. The requestor stated MS-DRG 176 does not appropriately account for cost and resource utilization associated with these cases.

CMS claims analysis supported the requestor’s statement about cost and resource utilization. CMS has finalized their proposals to:

• Reassign cases reporting diagnosis codes I26.01, I26.02 and I26.09 to MS-DRG 175, and
• Revise the MS-DRG 175 title to “Pulmonary Embolism with MCC or Acute Cor Pulmonale.”

The difference in relative weight (RW) and Geometric Mean Length of Stay (GMLOS) are reflected in the following table.

‍MDC 5: Diseases and Disorders of the Circulatory System

Transcatheter Mitral Valve Repair (TMVR) with Implant

CMS received a request to modify the current MS-DRG assignment for TMVR with implant procedures (MS-DRG 228 and 229: Other Cardiothoracic Procedures with MCC and without MCC, respectively). The requestor believed that TMVR is more similar to the replacement procedures in MS-DRGs 266 and 267 compared to other procedures currently assigned to MS-DRGs 228 and 229 and “noted that both TMVR procedures and endovascular cardiac valve replacements use a percutaneous approach, treat cardiac valves, and use an implanted device for purposes of improving the function of the specified valve.”

In the Proposed Rule CMS indicated “Our clinical advisors continue to believe that transcatheter cardiac valve repair procedures are not the same as a transcatheter (endovascular) cardiac valve replacement.

However, they agree with the requestor and, based on our data analysis, that these procedures are more clinically coherent in that they also describe endovascular cardiac valve interventions with implants and are similar in terms of average length of stay and average costs to cases in MS-DRGs 266 and 267 when compared to other procedures in their current MS-DRG assignment. For these reasons, our clinical advisors agree that we should propose to reassign the endovascular cardiac valve repair procedures (supplement procedures)…to the endovascular cardiac valve replacement MS-DRGs.”

CMS finalized the following proposals:

• Modify the structure of MS-DRGs 266 and 267 by reassigning the procedure codes describing transcatheter cardiac valve repair (supplement) procedure,
• Revise the title of MS-DRG 266 from “Endovascular Cardiac Valve Replacement with MCC” to “Endovascular Cardiac Valve Replacement and Supplement Procedures with MCC,”
• Revise the title of MS-DRG 267 from “Endovascular Cardiac Valve Replacement without MCC” to “Endovascular Cardiac Valve Replacement and Supplement Procedure without MCC,”
• Create two new MS-DRGs with a two-way severity split for the remaining (non-supplement) transcatheter cardiac valves.
• MS-DRG 319 (Other Endovascular Cardiac Valve Procedures with MCC), and
• MS-DRG 320 (Other Endovascular Cardiac Valve Procedures without MCC).

Pacemaker Leads

CMS noted that ICD-10-PCS procedure code 02H60JZ (Insertion of pacemaker lead into right atrium, open approach) was inadvertently omitted from the GROUPER logic for MS-DRGs 260, 261, and 262. They finalized adding this procedure code to the list of Non-O.R. procedures that would impact MS-DRGs 260, 261, and 262 when reported as a stand-alone procedure code.

MDC 8: Diseases and Disorders of the Musculoskeletal System and Connective Tissue

Knee Procedures with Principal Diagnosis of Infection

In FY 2019 ICD-10-CM diagnosis codes M00.9 (Pyogenic arthritis, unspecified) and A54.42 (Gonococcal arthritis) grouped to MS-DRGs 488 and 489 (Knee Procedures without Principal Diagnosis of Infection with and without CC/MCC, respectively) when a knee procedure is reported on the claim.

CMS received a request to add these two codes to the list of principal diagnoses for MS-DRGs 485, 486, 487 (Knee Procedure with Principal Diagnosis of Infection with MCC, with CC, and without CC/MCC, respectively).  

CMS finalized the following:

• Add both codes to the list of principal diagnosis codes for MS-DRGs 485, 486 and 487,
• Add 10 additional ICD-10-CM diagnosis codes specific to the knee and describing an infection; and
• Remove 8 ICD-10-CM diagnosis codes from the list of principal diagnosis for MS-DRG 485, 486 and 487 as they do not describe an infection of the knee.

Scoliosis: Neuromuscular and Secondary Scoliosis and Kyphosis

Requests were made to add ICD-10-CM diagnosis codes describing neuromuscular scoliosis, secondary scoliosis and secondary kyphosis to the list of principal diagnosis codes for MS-DRGs 456, 457, and 458 (Spinal Fusion except Cervical with Spinal Curvature or Malignancy or Infection or Extensive Fusions with MCC, with CC, without CC/MCC, respectively).

CMS finalized their proposals to:

• Add 5 codes describing neuromuscular scoliosis and 8 codes describing secondary scoliosis and secondary kyphosis to the list of principal diagnosis codes for MS-DRGs 456, 457, and 458; and
• Remove 34 ICD-10-CM diagnosis codes describing conditions involving the cervical region from MS-DRGs 456, 457, and 458.

MDC 11: Diseases and Disorders of the Kidney and Urinary Tract

Extracorporeal Shock Wave Lithotripsy (ESWL)

Data analysis revealed a steady decline in inpatient cases reporting urinary stones and an ESWL procedure over the past five years. CMS indicated in the proposed rule that due to an ESWL procedure being a Non-O.R. procedure and the decreased usage of this procedure in the inpatient setting, clinical advisors believe there is no longer a reason to subdivide the MS-DRGs for urinary stones (MS-DRGs 691 &692, and 693 & 694) based on ESWL procedures.

CMS finalized their proposals to:

• Delete MS-DRGs 691 and 692 (Urinary Stones with ESW Lithotripsy with CC/MCC and without CC/MCC respectively); and
• Revise the MS-DRG title for MS-DRGs 693 and 694 from “Urinary Stones without ESW Lithotripsy with MCC” and “without MCC”, respectively to “Urinary Stones with MCC” and “Urinary Stones without MCC.”

MDC 12: Diseases and Disorders of the Male Reproductive System

In FY 2019, four ICD-10-CM diagnosis codes (R93.811, R93.812, R93.813, and R93.819) describing body parts with male anatomy grouped to in MS-DRGs 302 and 303 (Atherosclerosis with MCC and without MCC, respectively) in MDC 5 (Diseases and Disorders of the Circulatory System).

Based on a request and claims data analysis, CMS finalized the reassignment of these four codes from MDC 5 in MS-DRGs 302 and 303 to MS-DRGs 729 and 730 (Other Male Reproductive System Diagnosis with CC/MCC and without CC/MCC, respectively) in MDC 12.

MDC 14: Pregnancy, Childbirth and the Puerperium

Reassignment of Diagnosis Code 099.89 (Other specified Diseases and Conditions complicating pregnancy, childbirth and the puerperium)

CMS finalized their proposal to reclassify ICD-10-CM diagnosis code 099.89 (Other specified diseases and conditions complicating pregnancy, childbirth and the puerperium) from a postpartum condition to an antepartum condition.

Coding logic will now assign a case with an O.R. procedure and this code to MS-DRGs 817, 818, or 819 (Other Antepartum Diagnoses with O.R. Procedure with MCC, with CC, and without CC/MCC, respectively). When no O.R. procedure is reported on the claim, the logic will assign the case to MS-DRGs 831, 832, and 833 (Other Antepartum Diagnoses without O.R. Procedure with MCC, with CC, and without CC/MCC, respectively).

MDC 23: Factors Influencing Health Status and Other Contacts with Health Services

Assignment of Diagnosis Code R93.89 (Abnormal finding on diagnostic imaging of other specified body structures)

There was a request to reassign ICD-10-CM diagnosis code R93.89 from MS-DRGs 302 and 303 (Atherosclerosis with MCC and without MCC, respectively) in the Circulatory MDC 5 to MDC 23.

CMS finalized their proposal to reassign this diagnosis code to MS-DRGs 947 and 948 (Signs and Symptoms with MCC and without MCC, respectively).

Review of Procedure Codes in MS-DRGS 981 through 983 and 987 through 989

Adding Procedures Codes Currently Grouping to MS-DRGS 981 – 983 and 987 – 989 into MDCs

Annually, CMS conducts a review of procedures resulting in assignment to the O.R. and non-extensive O.R. Procedures Unrelated to Principal Diagnosis MS-DRG Groups (981-983 and 987-989). This review is done on the basis of volume, by procedure, to see if it is more appropriate to move a procedure to a surgical MS-DRG for the MDC where the Principal Diagnosis falls.

Several proposals were made and finalized for FY 2020 to move diagnosis and procedure codes back into a specific MDC including:

• Gastrointestinal stromal tumors (GIST),
• Peritoneal dialysis catheter complications codes,
• Bone excision with pressure ulcers codes,
• Lower extremity muscle and tendon excision codes,
• Insertion of feeding device code,
• Basilic vein reposition in chronic kidney disease codes; and
• Colon Resection with Fistula code 0DTN0ZZ.

You can access the Final Rule and related tables on the FY 2020 IPPS Final Rule Home Page.