MS-DRG v44.0 · MDC 17: Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms
845 — Other Myeloproliferative Disorders or Poorly Differentiated Neoplastic Diagnoses without CC/MCC
Source: CMS MS-DRG v44.0 and FY2027 IPPS final rule. Page updated September 29, 2026.
- Relative weight
- 0.8447
- Geometric mean LOS
- 2.3 days
- Arithmetic mean LOS
- 3 days
- Type
- Medical
About MS-DRG 845
MS-DRG 845, Other Myeloproliferative Disorders or Poorly Differentiated Neoplastic Diagnoses without CC/MCC, is a medical DRG in MDC 17 (Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 0.8447, so Medicare's base payment for this DRG is about 0.84 times the average inpatient case (below average), before hospital-specific adjustments. The geometric mean length of stay is 2.3 days and the arithmetic mean is 3 days.
It belongs to a 3-level severity family: DRG 843 (with MCC, weight 1.9453), DRG 844 (with CC, weight 1.2551) and DRG 845 (without CC/MCC, weight 0.8447). The highest-severity level carries 2.3 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
110 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 845 (110)
Chapter 2: Neoplasms
- C37Malignant neoplasm of thymus
- C45.7Mesothelioma of other sites
- C45.9Mesothelioma, unspecified
- C48.0Malignant neoplasm of retroperitoneum
- C76.40Malignant neoplasm of unspecified upper limb
- C76.41Malignant neoplasm of right upper limb
- C76.42Malignant neoplasm of left upper limb
- C76.50Malignant neoplasm of unspecified lower limb
- C76.51Malignant neoplasm of right lower limb
- C76.52Malignant neoplasm of left lower limb
- C76.8Malignant neoplasm of other specified ill-defined sites
- C79.83Secondary malignant neoplasm of oral cavity
- C79.89Secondary malignant neoplasm of other specified sites
- C79.9Secondary malignant neoplasm of unspecified site
- C7A.00Malignant carcinoid tumor of unspecified site
- C7A.091Malignant carcinoid tumor of the thymus
- C7A.098Malignant carcinoid tumors of other sites
- C7A.1Malignant poorly differentiated neuroendocrine tumors
- C7A.8Other malignant neuroendocrine tumors
- C7B.00Secondary carcinoid tumors, unspecified site
- C7B.09Secondary carcinoid tumors of other sites
- C7B.1Secondary Merkel cell carcinoma
- C7B.8Other secondary neuroendocrine tumors
- C80.0Disseminated malignant neoplasm, unspecified
- C80.1Malignant (primary) neoplasm, unspecified
- C80.2Malignant neoplasm associated with transplanted organ
- C96.0Multifocal and multisystemic (disseminated) Langerhans-cell histiocytosis
- D09.3Carcinoma in situ of thyroid and other endocrine glands
- D09.8Carcinoma in situ of other specified sites
- D09.9Carcinoma in situ, unspecified
- D19.7Benign neoplasm of mesothelial tissue of other sites
- D19.9Benign neoplasm of mesothelial tissue, unspecified
- D36.7Benign neoplasm of other specified sites
- D36.9Benign neoplasm, unspecified site
- D3A.00Benign carcinoid tumor of unspecified site
- D3A.098Benign carcinoid tumors of other sites
- D3A.8Other benign neuroendocrine tumors
- D48.7Neoplasm of uncertain behavior of other specified sites
- D48.9Neoplasm of uncertain behavior, unspecified
- D49.81Neoplasm of unspecified behavior of retina and choroid
- D49.89Neoplasm of unspecified behavior of other specified sites
- D49.9Neoplasm of unspecified behavior of unspecified site
Chapter 4: Endocrine, nutritional and metabolic diseases
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
Chapter 21: Factors influencing health status and contact with health services
- Z85.00Personal history of malignant neoplasm of unspecified digestive organ
- Z85.01Personal history of malignant neoplasm of esophagus
- Z85.020Personal history of malignant carcinoid tumor of stomach
- Z85.028Personal history of other malignant neoplasm of stomach
- Z85.030Personal history of malignant carcinoid tumor of large intestine
- Z85.038Personal history of other malignant neoplasm of large intestine
- Z85.040Personal history of malignant carcinoid tumor of rectum
- Z85.048Personal history of other malignant neoplasm of rectum, rectosigmoid junction, and anus
- Z85.05Personal history of malignant neoplasm of liver
- Z85.060Personal history of malignant carcinoid tumor of small intestine
- Z85.068Personal history of other malignant neoplasm of small intestine
- Z85.07Personal history of malignant neoplasm of pancreas
- Z85.09Personal history of malignant neoplasm of other digestive organs
- Z85.110Personal history of malignant carcinoid tumor of bronchus and lung
- Z85.118Personal history of other malignant neoplasm of bronchus and lung
- Z85.12Personal history of malignant neoplasm of trachea
- Z85.20Personal history of malignant neoplasm of unspecified respiratory organ
- Z85.21Personal history of malignant neoplasm of larynx
- Z85.22Personal history of malignant neoplasm of nasal cavities, middle ear, and accessory sinuses
- Z85.230Personal history of malignant carcinoid tumor of thymus
- Z85.238Personal history of other malignant neoplasm of thymus
- Z85.29Personal history of malignant neoplasm of other respiratory and intrathoracic organs
- Z85.3Personal history of malignant neoplasm of breast
- Z85.40Personal history of malignant neoplasm of unspecified female genital organ
- Z85.41Personal history of malignant neoplasm of cervix uteri
- Z85.42Personal history of malignant neoplasm of other parts of uterus
- Z85.43Personal history of malignant neoplasm of ovary
- Z85.44Personal history of malignant neoplasm of other female genital organs
- Z85.45Personal history of malignant neoplasm of unspecified male genital organ
- Z85.46Personal history of malignant neoplasm of prostate
- Z85.47Personal history of malignant neoplasm of testis
- Z85.48Personal history of malignant neoplasm of epididymis
- Z85.49Personal history of malignant neoplasm of other male genital organs
- Z85.4APersonal history of malignant neoplasm of fallopian tube(s)
- Z85.50Personal history of malignant neoplasm of unspecified urinary tract organ
- Z85.51Personal history of malignant neoplasm of bladder
- Z85.520Personal history of malignant carcinoid tumor of kidney
- Z85.528Personal history of other malignant neoplasm of kidney
- Z85.53Personal history of malignant neoplasm of renal pelvis
- Z85.54Personal history of malignant neoplasm of ureter
- Z85.59Personal history of malignant neoplasm of other urinary tract organ
- Z85.6Personal history of leukemia
- Z85.71Personal history of Hodgkin lymphoma
- Z85.72Personal history of non-Hodgkin lymphomas
- Z85.79Personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues
- Z85.810Personal history of malignant neoplasm of tongue
- Z85.818Personal history of malignant neoplasm of other sites of lip, oral cavity, and pharynx
- Z85.819Personal history of malignant neoplasm of unspecified site of lip, oral cavity, and pharynx
- Z85.820Personal history of malignant melanoma of skin
- Z85.821Personal history of Merkel cell carcinoma
- Z85.828Personal history of other malignant neoplasm of skin
- Z85.830Personal history of malignant neoplasm of bone
- Z85.831Personal history of malignant neoplasm of soft tissue
- Z85.840Personal history of malignant neoplasm of eye
- Z85.841Personal history of malignant neoplasm of brain
- Z85.848Personal history of malignant neoplasm of other parts of nervous tissue
- Z85.850Personal history of malignant neoplasm of thyroid
- Z85.858Personal history of malignant neoplasm of other endocrine glands
- Z85.89Personal history of malignant neoplasm of other organs and systems
- Z85.9Personal history of malignant neoplasm, unspecified
- Z87.410Personal history of cervical dysplasia
Common questions about DRG 845
What is the relative weight of DRG 845?
- 0.8447 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 845?
- The geometric mean length of stay is 2.3 days; the arithmetic mean is 3 days.
Is DRG 845 medical or surgical?
- DRG 845 is a medical DRG.