Key facts for DRG 826
- FY2027 relative weight
- 4.7560
- Higher than 90% of all MS-DRGs
- Change vs FY2026
- +1.7%
- FY2026 weight 4.6780
- Geometric mean LOS
- 8.8 days
- Arithmetic mean 11.9 days
- MDC
- 17
- Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms
- Severity level
- with MCC (major complication or comorbidity)
- Transfer policy
- Not a transfer DRG
TL;DR
MS-DRG 826 is a surgical group in MDC 17 (Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms) at the highest-severity level of its family. CMS assigns it a FY2027 relative weight of 4.7560 with a geometric mean length of stay of 8.8 days and an arithmetic mean of 11.9. Its weight moved up 1.7% from FY2026 (4.6780). That weight is higher than 90% of all surgical and medical MS-DRGs. Its CC/MCC family (DRG 827, DRG 828) spans weights 1.6950 to 4.7560. The v44 Definitions Manual assigns it through 114 principal diagnosis codes and 4536 operating room procedures codes.
What changed from FY2026 to FY2027
CMS recalibrates every MS-DRG weight annually from the prior year's MedPAR claims. For DRG 826 the FY2027 relative weight is 4.7560 against 4.6780 in FY2026, a rise of 1.67%.
| Metric | FY2026 | FY2027 | Change |
|---|---|---|---|
| Relative weight | 4.6780 | 4.7560 | +0.0780 |
| Geometric mean LOS (days) | 8.4 | 8.8 | +0.4 |
| Arithmetic mean LOS (days) | 11.2 | 11.9 | +0.7 |
CC and MCC family
DRG 826 shares its base definition with 2 other MS-DRGs split by severity. The family's weights span 1.6950 to 4.7560, a 2.81× spread, which is the payment effect of documenting qualifying complications and comorbidities.
| DRG | Title | FY2027 weight | GMLOS |
|---|---|---|---|
| 826 | Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC | 4.7560 | 8.8 |
| 827 | Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with CC | 2.3890 | 3.9 |
| 828 | Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures without CC/MCC | 1.6950 | 2.2 |
Grouper logic (v44 Definitions Manual)
Principal Diagnosis: 114 ICD-10 codes drive assignment to this group; the first 12 are shown.
| ICD-10 code | Description |
|---|---|
| C37 | Malignant neoplasm of thymus |
| C457 | Mesothelioma of other sites |
| C459 | Mesothelioma, unspecified |
| C480 | Malignant neoplasm of retroperitoneum |
| C7640 | Malignant neoplasm of unspecified upper limb |
| C7641 | Malignant neoplasm of right upper limb |
| C7642 | Malignant neoplasm of left upper limb |
| C7650 | Malignant neoplasm of unspecified lower limb |
| C7651 | Malignant neoplasm of right lower limb |
| C7652 | Malignant neoplasm of left lower limb |
| C768 | Malignant neoplasm of other specified ill-defined sites |
| C7983 | Secondary malignant neoplasm of oral cavity |
Operating Room Procedures: 4536 ICD-10 codes drive assignment to this group; the first 12 are shown.
| ICD-10 code | Description |
|---|---|
| 0016070 | Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach |
| 0016071 | Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach |
| 0016072 | Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach |
| 0016073 | Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach |
| 0016074 | Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach |
| 0016075 | Bypass Cerebral Ventricle to Intestine with Autologous Tissue Substitute, Open Approach |
| 0016076 | Bypass Cerebral Ventricle to Peritoneal Cavity with Autologous Tissue Substitute, Open Approach |
| 0016077 | Bypass Cerebral Ventricle to Urinary Tract with Autologous Tissue Substitute, Open Approach |
| 0016078 | Bypass Cerebral Ventricle to Bone Marrow with Autologous Tissue Substitute, Open Approach |
| 001607A | Bypass Cerebral Ventricle to Subgaleal Space with Autologous Tissue Substitute, Open Approach |
| 001607B | Bypass Cerebral Ventricle to Cerebral Cisterns with Autologous Tissue Substitute, Open Approach |
| 00160J0 | Bypass Cerebral Ventricle to Nasopharynx with Synthetic Substitute, Open Approach |
Documentation and denial exposure
As a surgical DRG, assignment depends on a qualifying operating-room procedure being coded from the operative report; a missing or non-OR procedure code drops the stay into a medical DRG in MDC 17 with a lower weight. Because this family splits by severity, auditors target CC and MCC capture: each secondary diagnosis must be documented as present, monitored, evaluated or treated during the stay to survive a DRG-validation review. Typical inpatient denial codes for this group: CARC 16 (claim lacks information needed to group the stay), CARC 50 (the admission or procedure is judged not medically necessary), CARC 97 (a service is bundled into the DRG payment).
How QuickIntell uses DRG 826 data
QuickCode groups inpatient encounters against the current v44 logic, flags CC and MCC candidates that lack supporting documentation, and shows the weight difference across the family before the claim drops. QuickScribe captures the attending's language that supports severity, and QuickRCM works DRG-validation denials with the grouper evidence attached.
Frequently asked questions — DRG 826
What is MS-DRG 826?
MS-DRG 826 is "Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC", a surgical Medicare Severity Diagnosis-Related Group in MDC 17, Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms. Medicare pays inpatient stays grouped here at the hospital's base rate multiplied by the DRG relative weight.
What is the FY2027 relative weight for DRG 826?
The FY2027 relative weight is 4.7560 (IPPS final rule Table 5, effective October 1, 2026). In FY2026 it was 4.6780, a change of +1.7%.
What is the average length of stay for DRG 826?
CMS reports a geometric mean length of stay of 8.8 days and an arithmetic mean of 11.9 days for FY2027. The geometric mean is used for transfer-payment calculations.
Which DRGs are in the same CC/MCC family as 826?
DRG 827 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with CC, weight 2.3890); DRG 828 (Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures without CC/MCC, weight 1.6950). The family's weights range from 1.6950 to 4.7560, so documented complications and comorbidities change payment materially.
What documentation supports the severity level of DRG 826?
DRG 826 requires at least one secondary diagnosis on the CMS Major Complication or Comorbidity list, documented as present and clinically addressed during the stay (monitored, evaluated, treated or extending the stay). Conditions such as acute respiratory failure, severe sepsis or acute kidney injury with specified cause qualify only when the attending's note states the diagnosis itself, not just the lab values. Recovery auditors downgrade this group to the CC or base level when the MCC rests on an unconfirmed query or a resolved historical condition, so the query response and the discharge summary must agree.
Which codes group to DRG 826?
The v44 Definitions Manual lists 114 principal diagnosis codes and 4536 operating room procedures codes for this group. Examples from the principal diagnosis list: C37 (Malignant neoplasm of thymus); C457 (Mesothelioma of other sites); C459 (Mesothelioma, unspecified); C480 (Malignant neoplasm of retroperitoneum).
Is DRG 826 a post-acute transfer DRG?
No. DRG 826 is not on the FY2027 post-acute care transfer list, so the transfer per-diem policy does not apply to it.
Sources
Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-01. Verify against the primary file before billing or contracting decisions.
- IPPS FY2027 Final Rule Table 5 (CMS-1849-F)Version v44 FY2027 · effective 2026-10-01 · file CMS-1849-F Table 5.txtSHA-256 01003dd571c1e2f5…
- IPPS FY2026 Final Rule Table 5 (CMS-1833-F)Version v43 FY2026 · effective 2025-10-01 · file CMS-1833-F Table 5.txtSHA-256 bf8c390d14b3cd3e…
- ICD-10 MS-DRG Definitions Manual v44 (text)Version v44 · effective 2026-10-01 · file fy2027-fr-icd10-ms-drg-definitions-manual-files-v44.zipSHA-256 ae4f6c11727fe91f…
Disclaimer
This page is an operational reference compiled from the CMS IPPS FY2027 final rule (Table 5) and the v44 ICD-10 MS-DRG Definitions Manual. Relative weights are national factors; actual payment depends on each hospital's wage-adjusted base rate, add-ons, outliers and transfer adjustments. Nothing here is legal, clinical or billing advice; verify grouping against your encoder and the published CMS files.