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MS-DRG 810 · MDC 16 · Medical

MS-DRG 810: Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders without CC/MCC

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Data effective
Data currency: IPPS Table 5 FY2027 final rule (effective October 1, 2026); Definitions Manual v44 (effective October 1, 2026). Next CMS release: April 1, 2027 (v44.1 mid-year update), then the FY2028 final rule in August 2027.

Key facts for DRG 810

FY2027 relative weight
1.0750
Higher than 26% of all MS-DRGs
Change vs FY2026
+2.7%
FY2026 weight 1.0470
Geometric mean LOS
2.5 days
Arithmetic mean 3.2 days
MDC
16
Diseases and Disorders of Blood, Blood Forming Organs and Immunologic Disorders
Severity level
without CC or MCC
Transfer policy
Not a transfer DRG

TL;DR

MS-DRG 810 is a medical group in MDC 16 (Diseases and Disorders of Blood, Blood Forming Organs and Immunologic Disorders) at the base severity level of its family. CMS assigns it a FY2027 relative weight of 1.0750 with a geometric mean length of stay of 2.5 days and an arithmetic mean of 3.2. Its weight moved up 2.7% from FY2026 (1.0470). That weight is higher than 26% of all medical and surgical MS-DRGs. Its CC/MCC family (DRG 808, DRG 809) spans weights 1.0750 to 2.1710. The v44 Definitions Manual assigns it through 63 principal diagnosis codes.

What changed from FY2026 to FY2027

CMS recalibrates every MS-DRG weight annually from the prior year's MedPAR claims. For DRG 810 the FY2027 relative weight is 1.0750 against 1.0470 in FY2026, a rise of 2.67%, which exceeds the 2% threshold worth re-checking in contract models.

FY2026 versus FY2027 payment factors for MS-DRG 810
MetricFY2026FY2027Change
Relative weight1.04701.0750+0.0280
Geometric mean LOS (days)2.62.5-0.1
Arithmetic mean LOS (days)3.33.2-0.1
Weights shown are the FY2027 final values after the 10% cap on year-over-year reductions where applicable.

CC and MCC family

DRG 810 shares its base definition with 2 other MS-DRGs split by severity. The family's weights span 1.0750 to 2.1710, a 2.02× spread, which is the payment effect of documenting qualifying complications and comorbidities.

MS-DRGs in the same base group as DRG 810
DRGTitleFY2027 weightGMLOS
808Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders with MCC2.17105.1
809Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders with CC1.22603.3
810Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders without CC/MCC1.07502.5

Grouper logic (v44 Definitions Manual)

Principal Diagnosis: 63 ICD-10 codes drive assignment to this group; the first 12 are shown.

Principal Diagnosis codes assigned to DRG 810 (sample)
ICD-10 codeDescription
D590Drug-induced autoimmune hemolytic anemia
D5910Autoimmune hemolytic anemia, unspecified
D5911Warm autoimmune hemolytic anemia
D5912Cold autoimmune hemolytic anemia
D5913Mixed type autoimmune hemolytic anemia
D5919Other autoimmune hemolytic anemia
D592Drug-induced nonautoimmune hemolytic anemia
D594Other nonautoimmune hemolytic anemias
D595Paroxysmal nocturnal hemoglobinuria [Marchiafava-Micheli]
D596Hemoglobinuria due to hemolysis from other external causes
D598Other acquired hemolytic anemias
D599Acquired hemolytic anemia, unspecified

Documentation and denial exposure

As a medical DRG, assignment depends on the principal diagnosis sequenced from the attending's documentation; a secondary condition sequenced first, or a symptom code in place of the confirmed diagnosis, changes the MDC or the DRG. 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 810 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.

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Frequently asked questions — DRG 810

What is MS-DRG 810?

MS-DRG 810 is "Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders without CC/MCC", a medical Medicare Severity Diagnosis-Related Group in MDC 16, Diseases and Disorders of Blood, Blood Forming Organs and Immunologic Disorders. 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 810?

The FY2027 relative weight is 1.0750 (IPPS final rule Table 5, effective October 1, 2026). In FY2026 it was 1.0470, a change of +2.7%.

What is the average length of stay for DRG 810?

CMS reports a geometric mean length of stay of 2.5 days and an arithmetic mean of 3.2 days for FY2027. The geometric mean is used for transfer-payment calculations.

Which DRGs are in the same CC/MCC family as 810?

DRG 808 (Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders with MCC, weight 2.1710); DRG 809 (Major Hematological and Immunological Diagnoses Except Sickle Cell Crisis and Coagulation Disorders with CC, weight 1.2260). The family's weights range from 1.0750 to 2.1710, so documented complications and comorbidities change payment materially.

What documentation supports the severity level of DRG 810?

DRG 810 is the base-severity assignment: no secondary diagnosis on the CC or MCC lists was coded, or the only ones present are excluded for this principal diagnosis. Revenue-integrity review here looks for undercapture, meaning conditions treated during the stay (electrolyte disorders, specified anemia, acute blood loss, pressure injuries present on admission) that were never documented to the specificity the lists require. A compliant query to the attending, not a coder assumption, is the only way to move a stay to the CC or MCC sibling.

Which codes group to DRG 810?

The v44 Definitions Manual lists 63 principal diagnosis codes for this group. Examples from the principal diagnosis list: D590 (Drug-induced autoimmune hemolytic anemia); D5910 (Autoimmune hemolytic anemia, unspecified); D5911 (Warm autoimmune hemolytic anemia); D5912 (Cold autoimmune hemolytic anemia).

Is DRG 810 a post-acute transfer DRG?

No. DRG 810 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.

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.